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

8166285: Missing dependencies java.httpclient for tests from java/net pachage
Reviewed-by: chegar

8164982: Fix legal notices in java/lang, java/net, java/util tests.
Reviewed-by: darcy, iris

8153142: Cannot resolve multiple values from one response header
Reviewed-by: rriggs