Updating Apache Karaf to 4.2.2.

Change-Id: I346f21b8da7583c77e7b0612c7f2931aa63a67e0
diff --git a/tools/package/onos_stage.py b/tools/package/onos_stage.py
index a6b46d4..6ef1af1 100755
--- a/tools/package/onos_stage.py
+++ b/tools/package/onos_stage.py
@@ -27,7 +27,7 @@
 
 written_files = set()
 now = time.time()
-karaf_version = "4.2.1"
+karaf_version = "4.2.2"
 karaf_system = "apache-karaf-" + karaf_version + "/system/"
 
 def addFile(tar, dest, file, file_size):