sort options to make --help output prettier
sort options to make --help output prettier

explicitly sort options when adding them to argparse.
it's a bit silly to print them in a dict iteration order.

Change-Id: Id508331d7ee3b24e76be7fa958d27d29905bd3d2
Signed-off-by: YAMAMOTO Takashi <458bba2e4a8704776b33478100c98529b639cd9e@valinux.co.jp>

varunarya10/pbr,WiFast/pbr,emonty/oslo-packaging,openstack-dev/pbr,emonty/oslo-packaging,JioCloud/pbr,citrix-openstack-build/pbr,openstack-dev/pbr,redhat-openstack/pbr,citrix-openstack-build/pbr,JioCloud/pbr,WiFast/pbr,redhat-openstack/pbr,citrix-openstack-build/pbr,varunarya10/pbr,klmitch/pbr,klmitch/pbr,openstack-dev/pbr