Fix tox coverage test
Fix tox coverage test

tox coverage test failed by wrong project name

    PYTHON=coverage run --source $project --parallel-mode

should be:

    PYTHON=coverage run --source searchlightclient --parallel-mode

Change-Id: Iaee6653dd6d82c3187112f7a4cc03f149123a820
Signed-off-by: Trinh Nguyen <f87cc599f9e22238e9ddceba1aa34d0d1ff5071f@gmail.com>

openstack/python-searchlightclient,openstack/python-searchlightclient