bsc: Update cfg files to use mgw pooling VTY commands

OsmoBSC has supported this VTY interface since more than a year ago.
Let's update the config files to use the new "mgw" node.

The recently submitted VTY commands without the redundant "mgw" prefix
are still not used here in order to have the config file work with
latest release which still doesn't support those.

Related: SYS#5987
Change-Id: I9b869e6bf4a3910f38014d570dce27e67af6e0d6
3 files changed