Update the waitUntilReady/setReady logic to use java blocking

-Replace the while(!ready()) { checkReady() } logic to use
the java wait() and notifyAll() methods.

-Set a maximum timeout of 30s for a test to report that is
 is ready

Bug: 38512268
Test: runtest frameworks-telephony
Change-Id: I60c520d985a742c42baf7999079feeb726a27a99