openstack-status: improve reporting of neutron services

Report status of neutron-metadata-agent (on >= grizzly)
Report status of neutron-{nec,nyu,mlnx}-agent when installed
Move 'openvswitch' status report to 'Support services'
openstack-status: avoid deprecated commands

s/glance index/glance image-list/
s/nova-manage flavor list/nova flavor-list/
openstack-db: ask the user if changing the DB to mysql

If the DB is already configured as postgres for example,
then prompt the user do they really want to proceed with
a full DB reset to mysql.
bump release number