fixup _security_group_entries_list_sg() function : list security-groups by sg_id

Signed-off-by: Nicolas PLANEL <nicolas.planel@enovance.com>

Conflicts:

	neutron_plugin_contrail/plugins/opencontrail/ctdb/config_db.py
Merge pull request #78 from cloudwatt/fix_security_group_entries_list_sg

fixup _security_group_entries_list_sg() function : list security-groups ...