bug 845934 Telemetry for TLS Resumption rates r=honzab

--HG--
extra : rebase_source : 185c871273dcca7a84aafea5dc818033fcda945d
bug 848139 - telemetry for tls server hello size r=honzab

--HG--
extra : rebase_source : 5e8d1fa5e86ed7845cb196ad84539a6be024ca73