BZ #1052408 - HA Mysql manifest: allow creation of neutron db user.

https://bugzilla.redhat.com/show_bug.cgi?id=1052408

Add parameters to allow (optionally) the creation of the neutron db
user and set its db password.  Also switch to str2bool_i
from str2bool.
Merge pull request #103 from cwolferh/bz1052408_add_neutron_to_hamysql

BZ #1052408 - HA Mysql manifest: allow creation of neutron db user.