Do not override versions supplied by odlparent

Remove overrides which cause downgrades.

Change-Id: I7c55209cfce404368bfa732543197a9e1db91539
Signed-off-by: Robert Varga <rovarga@cisco.com>
Make sure to pick up junit version from odlparent

Fixes 4.10/4.11 inconsistency reported by maven. Also migrates imports
of Assert to the new place.

Change-Id: Id0953e69207ac9507b6baa0cc47bfaa938d86655
Signed-off-by: Robert Varga <rovarga@cisco.com>