This plugin moves the current content from the horizon repo to this
plugin repo. The code has been tested in a devstack install using the
following steps:

    1. packaging the plugin: "python setup.cfg sdist"
    2. pip installing the tar.gz in the resulting dist directory
    3.  a. (temporary step) remove existing sahara enabled files from
            horizon
            "rm openstack_dashboard/enabled/_18*.py"
        b. finding the install location and changing to it
            "cp sahara_dashboard/enabled/* /opt/stack/horizon/local/enabled"
    4. in /opt/stack/horizon
        a. python manage.py collectstatic
        b. python manage.py compress
    5. restarting the horizon server

Additionally, you can run the unit tests by:
    ./run_tests.sh

    Note: added script to programmatically remove the old configuration
    files from the targeted horizon install, either in venv or system
    install.

Known issues:
  1. running tests locally emits missing neutron service messages.
  2. plugin code for devstack needs to be added
  3. README is inadequate
  4. integration tests are still in horizon repo
  5. local copy of run_tests is heavy weight, but a better solution is
     not available currently.
  6. localization tooling and strings

Change-Id: Icdce2d3e945e612d368556dd5cea1930194c7b67