SEBA-513 Cleanup errors reported by xproto validator

Change-Id: I081534669a8b2ff542dfe9548847f5ff40a47643
diff --git a/containers/chameleon/Dockerfile.chameleon b/containers/chameleon/Dockerfile.chameleon
index 786793e..7cad4ff 100644
--- a/containers/chameleon/Dockerfile.chameleon
+++ b/containers/chameleon/Dockerfile.chameleon
@@ -13,7 +13,7 @@
 # limitations under the License.
 
 # xosproject/chameleon
-FROM xosproject/xos-base:2.2.11
+FROM xosproject/xos-base:2.2.12
 
 # xos-base already has protoc and dependencies installed