* Use setup_develop to install python module as most projects do.
This also makes translation management easier in development.
* Deploy 'enabled' files into horizon local/enabled directory.
* collectstatic and compress are no longer required during horizon
plugin installation. The timing of horizon installation was fixed
in https://review.openstack.org/#/c/257744/
Change-Id: I122d94af4c5e30ffa9e6c198460647073aace722
54fe2bc3d2