Many configuration values are hard-coded in the Trove devstack
plugin, however they would be better served letting the
user/developer decide what limits to impose.
The following variables were added to facilitate this:
TROVE_MAX_ACCEPTED_VOLUME_SIZE
TROVE_MAX_INSTANCES_PER_TENANT
TROVE_MAX_VOLUMES_PER_TENANT
TROVE_AGENT_CALL_LOW_TIMEOUT
TROVE_AGENT_CALL_HIGH_TIMEOUT
TROVE_RESIZE_TIME_OUT
TROVE_USAGE_TIMEOUT
TROVE_STATE_CHANGE_WAIT_TIME
These values are only inserted if they are set. If not set,
the Trove defaults are used instead.
Change-Id: I2c568fdfa05064682f372b996a5aebcdd4e93ef3
9e3860d54c