Cleanup of HA guide - AA-rabbitmq

added "the following" since "installing" was not used
corrected run on sentence, added period.
no changed to "not" - typo correction
password changed to plural, users and passwords
Added "the" before Grizzly and before OpenStack
changed in running to "that are running"
Removed extra space
changed has to have
changed to new convention per commente

Change-Id: I463e6eee95c724bf4cb4673042f40c84270c32dd
Merge "Cleanup of HA guide - AA-rabbitmq"