geo-rep: code pep8/flake8 fixes

pep8 is a style guide for python.
http://legacy.python.org/dev/peps/pep-0008/

pep8 can be installed using, `pip install pep8`

Usage: `pep8 <python file>`, For example, `pep8 master.py`
will display all the coding standard errors.

flake8 is used to identify unused imports and other issues
in code.

pip install flake8

cd $GLUSTER_REPO/geo-replication/
flake8 syncdaemon

Updated license headers to each source file.

Change-Id: I01c7d0a6091d21bfa48720e9fb5624b77fa3db4a
Signed-off-by: Aravinda VK <avishwan@redhat.com>
Reviewed-on: http://review.gluster.org/7311
Reviewed-by: Kotresh HR <khiremat@redhat.com>
Reviewed-by: Prashanth Pai <ppai@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>