Miscellaneous STC adjustments

Change-Id: Ia1d5629d075646192f154b03bec6a71a8ac44dbd
diff --git a/tools/test/bin/onos-mininet b/tools/test/bin/onos-mininet
index 5256166..9079e88 100755
--- a/tools/test/bin/onos-mininet
+++ b/tools/test/bin/onos-mininet
@@ -6,7 +6,7 @@
 [ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
 . $ONOS_ROOT/tools/build/envDefaults
 
-export MAX_WAIT=60
+export MAX_WAIT=${ONOS_MN_TIMEOUT:-90}
 
 cmd="$1" && shift
 log="screenlog.0"