Users can specify database address and port for mysql backend
of Ceilometer. Currently ceilometer_database_mysql_address
incorrectly includes port. This is unnecessary, also Ceilometer
bootstrapping (mysql_user, mysql_db Ansible modules) wants to use
these variables separately.
Change-Id: I88f5359517fcf4f119ec6abfdf16a15a4e33b6fd
Closes-Bug: #1639786