Build is broken due to use of disappeared milestone URLs

Move to Tycho 1.4.0 and fix build by using final release
p2 repo URLs that will be retained indefinitely.

Bug: 542523
Change-Id: I824c81a181a68648e01f298fcb758d4085553f2e
Signed-off-by: Mat Booth <mat.booth@redhat.com>
4 files changed