Update maven/tycho plug-in versions to latest

Updating to latest tycho (and therefore latest p2) allows us to
get rid of some hacks that were working around a bug in p2, see
bug 313553 for details.

Change-Id: I7691ea2a6b9f47331fa43a6a061545fac9b2314e
Signed-off-by: Mat Booth <mat.booth@redhat.com>
3 files changed