Fix DB Sync

The DB sync script should be calling `trove-manage db_sync`,
not `trove-db-sync`.
Configure auth via conf file, not paste file

The paste file now lives in /usr/share, and shouldn't be
modified.  Configure the keystone auth token settings in
trove.conf instead.
Set control_exchange in the main config file

`control_exchange = trove` should be set in the main config file.
Support Neutron

The network driver and network label regex need to be set properly
for neutron to work.