Fixing buck in onos-pref-karaf

Change-Id: Ie94bf690a1df836b4d5b1d6a1297518f823258c2
diff --git a/tools/package/onos-prep-karaf b/tools/package/onos-prep-karaf
index 0dca061..4eb72c0 100755
--- a/tools/package/onos-prep-karaf
+++ b/tools/package/onos-prep-karaf
@@ -12,7 +12,7 @@
 #FIXME karaf version
 KARAF_VERSION="3.0.5"
 
-PREFIX="onos-${ONOS_VERSION/-SNAPSHOT/}"
+PREFIX="onos-$ONOS_VERSION"
 
 # Unroll the Apache Karaf bits, prune them and make ONOS top-level directories.
 tar xf $KARAF_TAR