Updated openstack/openstack
Project: openstack/oslo-incubator  b7eebfed19268016b51ff886b40a6f3cd0b491df

Improve documentation of run_tests.sh script

Fix typos and change a few sentences of run_tests.sh script.
Also insert punctuation marks in several sentences of help message
to keep a pattern.

Change-Id: I554905f619ff3c5300b2e2603f247596816ac945