Require OsmoMgw in OsmoBsc and update tests

Since Change-Id Ia2882b7ca31a3219c676986e85045fa08a425d7a, osmo-bsc
uses osmo-mgw and utilizes libosmo-mgcp-client to talk to it.

This commit fixes latest constant failures in voice suite.

Change-Id: I1dadd781a357fce33e7bde55e4bcbdaeb4633359
diff --git a/suites/voice/suite.conf b/suites/voice/suite.conf
index 40d9f97..522b1ca 100644
--- a/suites/voice/suite.conf
+++ b/suites/voice/suite.conf
@@ -1,6 +1,6 @@
 resources:
   ip_address:
-  - times: 5 # msc, bsc, hlr, stp, mgw
+  - times: 6 # msc, bsc, hlr, stp, mgw*2
   bts:
   - times: 1
   modem: