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

bsc/osmo-bsc-sccplite.cfg

@@ -44,6 +44,8 @@ network
  handover maximum distance 9999
  timer t3113 10
  timer t3212 30
+ mgw 0
+  mgw remote-ip 127.0.0.1
  bts 0
   type osmo-bts
   band DCS1800
@@ -354,7 +356,6 @@ msc 0
  amr-config 5_15k forbidden
  amr-config 4_75k forbidden
  codec-list fr1 fr2 fr3 hr1 hr3
- mgw remote-ip 127.0.0.1
  asp-protocol ipa
 bsc
  mid-call-timeout 0

bsc/osmo-bsc-vamos.cfg

@@ -68,6 +68,8 @@ network
  handover maximum distance 9999
  timer t3113 10
  timer t3212 30
+ mgw 0
+  mgw remote-ip 127.0.0.1
  bts 0
   type osmo-bts
   band DCS1800
@@ -378,14 +380,11 @@ msc 0
  amr-config 5_15k forbidden
  amr-config 4_75k forbidden
  codec-list fr1 fr2 fr3 hr1 hr3
- mgw remote-ip 127.0.0.1
  lcls-mode mgw-loop
 msc 1
  msc-addr msc2
- mgw remote-ip 127.0.0.1
 msc 2
  msc-addr msc3
- mgw remote-ip 127.0.0.1
 
 network
  nri bitlen 10

bsc/osmo-bsc.cfg

@@ -68,6 +68,8 @@ network
  handover maximum distance 9999
  timer t3113 10
  timer t3212 30
+ mgw 0
+  mgw remote-ip 127.0.0.1
  bts 0
   type osmo-bts
   band DCS1800
@@ -480,14 +482,11 @@ msc 0
  amr-config 5_15k forbidden
  amr-config 4_75k forbidden
  codec-list fr1 fr2 fr3 hr1 hr3
- mgw remote-ip 127.0.0.1
  lcls-mode mgw-loop
 msc 1
  msc-addr msc2
- mgw remote-ip 127.0.0.1
 msc 2
  msc-addr msc3
- mgw remote-ip 127.0.0.1
 
 network
  nri bitlen 10