Appc jobs to maven 3.5

Maven 3.5 is required for the new version of
Opendaylight.

Change-Id: Ic25032f3b3a1cc61a3dc57e849ce76a3bf3f90a6
Signed-off-by: Patrick Brady <patrick.brady@att.com>
Issue-ID: APPC-1749
diff --git a/jjb/appc/appc-parent.yaml b/jjb/appc/appc-parent.yaml
index 7a931c0..eafd4b9 100644
--- a/jjb/appc/appc-parent.yaml
+++ b/jjb/appc/appc-parent.yaml
@@ -23,6 +23,7 @@
       - 'master':
           branch: 'master'
     mvn-settings: 'appc-parent-settings'
+    maven-version: "mvn35"
     build-node: ubuntu1604-builder-2c-1g
 
 - project: