mgcp-client: Fix 'mgw endpoint-range' command dropped from old VTY node

That command was already deprecated when the new commands without the
"mgw" prefix were dropped, so there was no need to create a new command
for it (since it shouldn't be used and it's currently implemented as a
NOOP).

However, the recent patch moved the install line out of the common
function, which meant the command was not available anymore on the old
node, and as a result old config files using it would fail to be parsed.

This commit moves the command back to the common function so that it is
still available for config files using the old node.

Related: SYS#5987
Fixes: 8c138fe89cc070f860eca641481a092225b1247e
Change-Id: I800abcc9869ed097a9d28715269c42552f5aaf29
1 file changed