Note 1) we're not supposed to be using #!/usr/bin/env python, see
https://fedoraproject.org/wiki/Packaging:Guidelines?rd=Packaging/Guidelines#Shebang_lines

Note 2) we're also not supposed to be using "!/usr/bin/python,
see https://fedoraproject.org/wiki/Changes/Avoid_usr_bin_python_in_RPM_Build#Quick_Opt-Out

The previous patch (https://review.gluster.org/19767) tried to do too
much in one patch, so it was abandoned.

This patch does two things:
1) minor cleanup of configure(.ac) to explicitly use python2
2) change all the shebang lines to #!/usr/bin/python2 and add them
where they were missing based on warnings emitted during rpmbuild.

In a follow-up patch python2 will eventually be changed to python3.

Before that python2-isms (e.g. print, string.join(), etc.) need to be
converted to python3. Some of those can be rewritten in version agnostic
python. E.g. print statements become print() with "from __future_ import
print_function". The python 2to3 utility will be used for some of those.
Also Aravinda has given guidance in the comments to the first patch for
changes.

updates: #411
Change-Id: I471730962b2526022115a1fc33629fb078b74338
Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com>

Added sample unit test file,
$GLUSTER_SRC/geo-replication/tests/unit/test_syncdutils.py

Install unittest dependencies, (tox https://tox.readthedocs.org/en/latest/,
nose https://nose.readthedocs.org/en/latest/)
    sudo pip install --upgrade tox nose

To run pep8 coding standards tests,
    cd $GLUSTER_SRC/geo-replication
    tox -e pep8

To run unit tests,
    cd $GLUSTER_SRC/geo-replication
    tox -e py27

py27 is for with Python 2.7+, or py26 for systems
with Python 2.6+

Change-Id: Ibdefe2c9d73afda9a7fa1c0db5b126f592b7cb40
BUG: 1177722
Signed-off-by: Aravinda VK <avishwan@redhat.com>
Reviewed-on: http://review.gluster.org/9290
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Prashanth Pai <ppai@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>