This commit adds State Change support to the LBaaS resources which should
help with clean terminations.
It also adds an acceptance tests that builds out a 2-node load balance
service.
This commit makes a few attributes computed so the generated information
is accessible after creation.
It also fixes the "persistence" attribute, which previously had a typo.
Finally, it converts "admin_state_up" to a Boolean to match the majority
of other attributes of the same name.
Joe Topjian