Bumping STC to 2.2 version.

Change-Id: Ib39eef58b41b33a7fcf858f84c64a10a91304005
diff --git a/tools/test/bin/stc b/tools/test/bin/stc
index 34abe14..e52d29b 100755
--- a/tools/test/bin/stc
+++ b/tools/test/bin/stc
@@ -5,7 +5,7 @@
 
 . $ONOS_ROOT/tools/build/envDefaults
 
-VER=${STC_VERSION:-2.1}
+VER=${STC_VERSION:-2.2}
 JAR=~/.m2/repository/org/onosproject/onos-stc/$VER/onos-stc-$VER.jar
 SCENARIOS=$ONOS_ROOT/tools/test/scenarios