travis: fix for duplicate mvn arg

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
parent: getting rid of snapshot repositories, oss-parent version bump

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
global: jaxws-maven-plugin version bump

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>
test-utils: fix for aggregate test-utils dependency

Signed-off-by: Ketoth Xupack <ketoth.xupack@gmail.com>