mcgp: let the MGW allocate the MGCP endpoint

osmo-msc still uses endpoints that are allocated locally by the
MGCP-Client. Since osmo-mgw now supports the more comfortable,
dynamic variant we should make use of it.

- Replace the endpoint numer allocation by the client with a
  wildcarded CRCX. Use the endpoint that is assigned by the
  MGW.

Related: OS#2710
Change-Id: Iee3e446b6689626516f01c521abe3d4603cd3e13
2 files changed