docker: Give container selfdescriptive name

This works great to hosts wich many containers

Example:
avocado run --docker debian-avocado-test /bin/true
DOCKER     : Container id '0f9ebae391183937fb6e98c50cc10f4927963140caf6e63fd108876a6ac7270f'
DOCKER     : Container name 'job-2016-10-02T07.14-a404c72.avocado'
..

avocado/plugins/docker.py

@@ -14,6 +14,8 @@
 """Run the job inside a docker container."""
 
 import logging
+import os
+import socket
 import time
 
 import aexpect
@@ -33,7 +35,7 @@ class DockerRemoter(object):
     of the commands on docker container.
     """
 
-    def __init__(self, dkrcmd, image, options):
+    def __init__(self, dkrcmd, image, options, name=None):
         """
         Executes docker container and attaches it.
 
@@ -42,6 +44,11 @@ class DockerRemoter(object):
         """
         self._dkrcmd = dkrcmd
         self._docker = None
+
+        if name is not None:
+            options += " --name %s --hostname %s" % \
+                       (name, name + '.' + socket.gethostname())
+
         run_cmd = "%s run -t -i -d %s '%s' bash" % (self._dkrcmd, options, image)
         self._docker_id = (process.system_output(run_cmd, None).splitlines()[-1]
                            .strip())
@@ -134,11 +141,13 @@ class DockerTestRunner(RemoteTestRunner):
     def setup(self):
         dkrcmd = self.job.args.docker_cmd
         dkr_opt = self.job.args.docker_options
-        self.remote = DockerRemoter(dkrcmd, self.job.args.docker, dkr_opt)
+        dkr_name = os.path.basename(self.job.logdir) + '.' + 'avocado'
+        self.remote = DockerRemoter(dkrcmd, self.job.args.docker, dkr_opt, dkr_name)
         # We need to create the base dir, otherwise docker creates it as root
         self.remote.makedir(self.remote_test_dir)
         self.job.log.info("DOCKER     : Container id '%s'"
                           % self.remote.get_cid())
+        self.job.log.debug("DOCKER     : Container name '%s'" % dkr_name)
         self.job.args.remote_no_copy = self.job.args.docker_no_copy
 
     def tear_down(self):