build: maven: move all repos to top level pom, remove unused

otherwise maven gets confused.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1139016
Change-Id: I0599fc0293ab3e3f11b5fb7adb22c76b58d590bf
Signed-off-by: Alon Bar-Lev <alonbl@redhat.com>