Remove plugin version overrides

We should not be overriding versions provided by odlparent, as
that is really downgrading them. Remove the overrides and cleanup
whitespace.

Change-Id: I5e1a8c8b1f3d0f95932c825ff27620f5c4806e6f
Signed-off-by: Robert Varga <robert.varga@pantheon.tech>