BUG 482186: AbstractRepositorySettingsPage server URL disabled

* Add API to the AbstractRepositorySettingsPage to disable the
serverUrlCombo.

Change-Id: I7b1024759122e0542eb8bd6cf65f4927664e384d
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=482186
Signed-off-by: Colin Ritchie <colin.ritchie@tasktop.com>
2 files changed