Add maintenance services as stx-metal plugin.
Enable services by both node type and metal components.
Target:
Mtce services are installed and active(running) in devstack.
Story: 2003161
Task: 23296
Change-Id: I2123c64fb1b70bd135e8945d7ff7f4f3691bdbcc
Signed-off-by: Mingyuan Qi <mingyuan.qi@intel.com>