pcu: Add VTY support and use it to set (M)CS lqual thresholds

Requires osmo-pcu.git I3430abb5fc622dec293457466e760de95fa3a05c, before
that commit OsmoPCU cmd prompt contained a dash which resulted in TTCN3
being unable to match it.

Change-Id: I221675721b65b3ab44179e9657da70ba4004d7de
diff --git a/pcu/PCU_Tests.default b/pcu/PCU_Tests.default
index 2a87345..537744f 100644
--- a/pcu/PCU_Tests.default
+++ b/pcu/PCU_Tests.default
@@ -21,10 +21,20 @@
 	},
 	sgsn_role := true
 }
+Osmocom_VTY_Functions.mp_prompt_prefix := "OsmoPCU";
 
 [TESTPORT_PARAMETERS]
 *.*.udpReuseAddress := "yes";
 *.PCU.socket_type := "SEQPACKET"
+*.PCUVTY.CTRL_MODE := "client"
+*.PCUVTY.CTRL_HOSTNAME := "127.0.0.1"
+*.PCUVTY.CTRL_PORTNUM := "4240"
+*.PCUVTY.CTRL_LOGIN_SKIPPED := "yes"
+*.PCUVTY.CTRL_DETECT_SERVER_DISCONNECTED := "yes"
+*.PCUVTY.CTRL_READMODE := "buffered"
+*.PCUVTY.CTRL_CLIENT_CLEANUP_LINEFEED := "yes"
+*.PCUVTY.CTRL_DETECT_CONNECTION_ESTABLISHMENT_RESULT := "yes"
+*.PCUVTY.PROMPT1 := "OsmoPCU> "
 
 [MAIN_CONTROLLER]