Remove gp_df utility

This is a OS agnostic df utility that worked on both Solaris and Linux.
However, we no longer support solaris and this isn't referenced or
mentioned in the docs anywhere.
Authored-by: NChris Hajas <chajas@pivotal.io>

gpMgmt/bin/gp_df

-#!/usr/bin/env python
-
-'''
-USAGE: gp_df [-m]
-platform independent df command
-where -m will display output in megabytes
-'''
-
-import os, re, sys, time, subprocess
-
-try:
-    from optparse import Option, OptionParser 
-    from gppylib.gpparseopts import OptParser, OptChecker
-    from gppylib.commands.unix import SYSTEM
-except ImportError, e:    
-    sys.exit('Cannot import modules.  Please check that you have sourced greenplum_path.sh.  Detail: ' + str(e))
-
-class BytesFormatter:
-    BYTES = 1
-    KILOBYTES = 2
-    MEGABYTES = 3
-
-
-class FileSystem:
-    def __init__(self, device, dir, type):
-        self.device = device
-        self.dir = dir
-        self.type = type
-        self.total_bytes = 0
-        self.used_bytes = 0
-        self.available_bytes = 0
-
-    @staticmethod
-    def PrintHeader(formatter):
-        if formatter == BytesFormatter.BYTES:
-            used = "USED_BYTES"
-            available = "AVAILABLE_BYTES"
-        elif formatter == BytesFormatter.KILOBYTES:
-            used = "USED_KB"
-            available = "AVAILABLE_KB"
-        elif formatter == BytesFormatter.MEGABYTES:
-            used = "USED_MB"
-            available = "AVAILABLE_MB"
-        else:
-            raise Exception("unknown bytes formatter")
-            
-        print "%s %s %s %s %s" % ("DEVICE", "DIR", "TYPE", used, available)
-
-    def Print(self, formatter):
-        try:
-            if formatter == BytesFormatter.BYTES:
-                used = self.used_bytes
-                available = self.available_bytes
-            elif formatter == BytesFormatter.KILOBYTES:
-                used = int(self.used_bytes/1024)
-                available = int(self.available_bytes/1024)
-            elif formatter == BytesFormatter.MEGABYTES:
-                used = int(self.used_bytes/1024/1024)
-                available = int(self.available_bytes/1024/1024)
-            else:
-                raise Exception("unknown bytes formatter")
-        except Exception, e:
-            print >> sys.stderr, e.__str__()
-            print >> sys.stderr, "Error converting disk usage to numerical form"
-            sys.exit(1)
-        except:
-            print >> sys.stderr, "Error converting disk usage to numerical form"
-            sys.exit(1)
- 
-        print "%s %s %s %d %d" % (self.device, self.dir, self.type, used, available)
-
-def getLinuxDirectoryList():
-
-    interestedFSTypes = set(['xfs', 'ext3', 'ext4'])
-
-    fsList = []
-    try:
-        fd = open('/proc/mounts')
-        buffer = fd.read()
-        fd.close()
-        for line in buffer.splitlines():
-            fields = line.split()
-            if len(fields) != 6:
-                raise Exception("Wrong number of fields in /proc/mounts entry: %s" % line.strip())
-            if fields[2] not in interestedFSTypes:
-                continue
-            fsList.append(FileSystem(device=fields[0], dir=fields[1], type=fields[2]))
-    except Exception, e:
-        print >> sys.stderr, e.__str__()
-        print >> sys.stderr, "Error reading list of mounts"
-        sys.exit(1)
-    except:
-        print >> sys.stderr, "Error reading list of mounts"
-        sys.exit(1)
-
-    return fsList
-
-
-def getSolarisDirectoryList():
-
-    cmd = "zfs list -H -t filesystem -o name,mountpoint"
-    p = subprocess.Popen(cmd, shell = True, stdout = subprocess.PIPE, stderr = subprocess.PIPE)
-    result = p.communicate()
-    errormsg = result[1].strip()
-    output = result[0]
-    if p.returncode:
-        print >> sys.stderr, errormsg
-        print >> sys.stderr, "error getting zpool information from host"
-        sys.exit(1)
-
-    fsList = []
-    for line in output.splitlines():
-        fields = line.split()
-        if len(fields) != 2:
-            print >> sys.stderr, "bad output line from zfs list: %s" % line
-            continue
-
-        # we want only zfs pools not filesystems that are a subset of a zfs pool
-        fsname = fields[0].strip()
-        mount = fields[1].strip()
-        if re.search("/", fsname):
-            continue
-        fsList.append(FileSystem(device=fsname, dir=mount, type='zfs'))
-
-    return fsList
-
-
-def getDirectoryList():
-
-    if SYSTEM.getName() == "linux":
-        return getLinuxDirectoryList()
-    elif SYSTEM.getName() == "sunos":
-        return getSolarisDirectoryList()
-    else:
-        print >> sys.stderr, "Unsupported platform"
-        sys.exit(1)
-
-
-###### main()
-if __name__ == '__main__':
-
-    gphome = os.environ.get('GPHOME')
-    if not gphome:
-        print "GPHOME not set"
-        sys.exit(1)
-
-    parser = OptParser(option_class=OptChecker)
-    parser.remove_option('-h')
-    parser.add_option('-h', '-?', '--help', action='store_true')
-    parser.add_option('-m', '--megabytes', action='store_true')
-    (options, args) = parser.parse_args()
-
-    if options.help:
-        print __doc__
-        sys.exit(1)
-
-    fsList = getDirectoryList()
-
-    for fs in fsList:
-        stats = os.statvfs(fs.dir)
-        fs.total_bytes =  stats.f_frsize * stats.f_blocks 
-        fs.available_bytes = stats.f_frsize * stats.f_bfree
-        fs.used_bytes = fs.total_bytes - fs.available_bytes
-
-        if fs.used_bytes < 0:
-            print >> sys.stderr, "statvfs output for device=%s dir=%s has more free bytes than total bytes" % (fs.device, fs.dir)
-            print >> sys.stderr, stats
-            sys.exit(1)
-
-    if options.megabytes:
-        formatter = BytesFormatter.MEGABYTES
-    else:
-        formatter = BytesFormatter.BYTES
-
-    FileSystem.PrintHeader(formatter)
-    for fs in fsList:
-        fs.Print(formatter)
-
-