[#85143904] * protected reuquests queue during reschedule process to emilinate posibility send any of them till process completion
[#85145520] * fixed issue with state flag which prevented client from check whether subscription should be restored using last time token or not
[#85143904] * fixed subscription update logic and queue clean up on reschedule during leave cycle
* fixed singleton code because of which reference on delegate has been used out of sequence outisde of private queue on which it has been sent
Update test for 3.7.7.