Fix maven-exec path to path on minion nodes

Fix maven-exec path to path on minion nodes

The Maven tools directory on minion nodes is in /w so fix maven-exec to
point there. Also JJB doesn't handle space -> underscore (_) conversion
so use new mvn33 profile name for Maven path.

Follow on patches should be created to migrate all jobs to use new mvn
shortnames and remove the default variables for {mvn33}, {mvn32},
{mvn31} etc... This simplifies ODL JJB a little bit.

Change-Id: I77951c29b6dadca1246f88ac0f537d09f3c171ac
Signed-off-by: Thanh Ha <thanh.ha@linuxfoundation.org>