The unit tests were broken with MinimizeIPTablesRestore enabled
because syncProxyRules() assumed that needFullSync would be set on the
first (post-setInitialized()) run, but the unit tests didn't ensure
that.
(In fact, there was a race condition in the real Proxier case as well;
theoretically syncProxyRules() could be run by the
BoundedFrequencyRunner after OnServiceSynced() called setInitialized()
but before it called forceSyncProxyRules(), thus causing the first
real sync to try to do a partial sync and fail. This is now fixed as
well.)
b9bc0e5ac8