Fix major below issues:
E741 ambiguous variable name 'l'
./openstack/python-horizon/centos/files/guni_config.py
E402 module level import not at top of file
./openstack/python-horizon/centos/files/local_settings.py
E265 block comment should start with '# '
./openstack/python-horizon/centos/files/local_settings.py
Story: 2003428
Task: 24617
Change-Id: I9d4d6c33ce032849f09e2ec232c83909fc6690a3
Signed-off-by: Sun Austin <austin.sun@intel.com>