Changes

[releng] Remove obsolete p2 repository reference

The reference to the snapshot e4.ui repository was added in commit
4e029c3ab. At that time, the then brand-new smart import wizard was not
available yet in any release repository. Nowadays it is, and so this
reference is no longer useful.

Bug: egit-32
Change-Id: I03e0594bb90134146f9b10852e7a912b924bd757
Signed-off-by: Thomas Wolf <twolf@apache.org>