8181867: [tests] Reorganize EchoHandlers
Summary: This fix reorganize some test files and rename some test classes. Several classes named EchoHandler in the unnamed package are renamed to make it clear what classes (and sources) tests that use these EchoHandler implementations effectively depend on.
Reviewed-by: chegar

8180044: java/net/httpclient/ManyRequests.java failed due to timeout
Summary: Fixes several race conditions observed while testing.
Reviewed-by: michaelm, msheppar, prappo

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

8169002: Several java/net/httpclient have undeclared dependency on java.logging module
Reviewed-by: chegar, rriggs, dfuchs

8151913: Fix module dependencies in java/net tests
Summary: Module dependency declaration for java/net/* tests
Reviewed-by: alanb
Contributed-by: John Jiang <sha.jiang@oracle.com>

8087124: HTTP/2 implementation
Reviewed-by: chegar

8087112: HTTP API and HTTP/1.1 implementation
Reviewed-by: alanb, chegar, coffeys, psandoz, rriggs