8183514: Remove intermittent key from httpclient test TimeoutOrdering and ErrorTest
Reviewed-by: dfuchs

8178147: Race conditions in timeout handling code in http/2 incubator client
Summary: Timeout handling code (in particular cancel(IOException)) is modified to take into account cancellation arising before exchange implementation is established or response completable future is created. TimeoutEvent::compareTo method is modified to be consistent with TimeoutEvent::equals.
Reviewed-by: prappo, chegar, michaelm

8171081: Put TimeoutOrderingTest in ProblemList for solaris-all
Reviewed-by: chegar

8170648: Move java.net.http package out of Java SE to incubator namespace
Reviewed-by: chegar, dfuchs, michaelm, prappo, skuksenko
Contributed-by: Chris Hegarty <chris.hegarty@oracle.com>, Daniel Fuchs <daniel.fuchs@oracle.com>, Michael McMahon <michael.x.mcmahon@oracle.com>, Pavel Rappo <pavel.rappo@oracle.com>, Sergey Kuksenko <sergey.kuksenko@oracle.com>, anthony.vanelverdinghe@gmail.com