cbuilbdot: preserve manifest-version checkouts across clobbers.

At this point our sync/cleanup machinery can reset the repo as
necessary- no point in inducing full manifest-version clones just
because we needed to rebuild the repo checkout.

BUG=None
TEST=manual

Change-Id: Iac8d652a30f19b429155470ee08449c240505023
Reviewed-on: https://gerrit.chromium.org/gerrit/28870
Commit-Ready: Brian Harring <ferringb@chromium.org>
Tested-by: Brian Harring <ferringb@chromium.org>
Reviewed-by: David James <davidjames@chromium.org>
1 file changed