Don't hard code notification types into Monasca client
Don't hard code notification types into Monasca client

Available notification types depend on what is enabled in Monasca
Notification. As such, we should avoid hard coding them into the
client and rely on the Monasca API to validate whether a type is
supported, and to list the supported types.

Change-Id: Icc18bffa04806235583459721f8cb8e36a247f05
Story: 2005551
Task: 37848

openstack/python-monascaclient,stackforge/python-monascaclient,stackforge/python-monascaclient,openstack/python-monascaclient