The mgw-pool now allows to set a decription for each MGW /MGCP client
instance. Update the documentation so that it reflects the current
state.
Change-Id: I3026e027bba1a9a12ceca64e96df993b5957cb1d
Related: SYS#5091
Since the libosmo-mgcp-client now supports MGW pooling, lets use this
feature in osmo-bsc. Large RAN installations may benefit from
distributing the RTP voice stream load on multiple media gateways.
Depends: osmo-mgw Icaaba0e470e916eefddfee750b83f5f65291a6b0
Change-Id: I8f33ab2cea04b545c403a6fe479aa963a0fc0d0d
Related: SYS#5091