avocado/profiler.py: remove module that has been a placeholder

The idea of profilers running along a test is a pretty common and
desirable feature. But, for avocado, at least for now, we're seing
that feature emerging as an extention of the sysinfo module.

So, to avoid confusion, let's remove this placeholder module.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

avocado/profiler.py

-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; specifically version 2 of the License.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
-#
-# See LICENSE for more details.
-#
-# This code was inspired in the autotest project,
-# client/profilers
-# Authors: Martin J Bligh <mbligh@google.com>, John Admanski <jadmanski@google.com>
-
-"""
-Profilers are programs that run on background, that aim to measure some system
-aspect, such as CPU usage, IO throughput, memory usage, syscall count, among
-others.
-
-This module implements the profiler class, that contains the needed skeleton
-for people to implement their own profilers.
-"""
-
-
-class Profiler(object):
-
-    def __init__(self, job):
-        self.job = job
-
-    def setup(self, *args, **dargs):
-        return
-
-    def start(self, test):
-        return
-
-    def stop(self, test):
-        return
-
-    def report(self, test):
-        return