This allows running 'init-repository --no-update -f' to initialise
and fetch new submodules without attempting to updating existing
submodules which may have new commits applied which may cause the
update to fail.

Change-Id: I48040bc42235231eec3bc85b643b688c8e8b4bd9
Sanity-Review: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>