RFR: JDK-8075327: Merge jdk and hotspot test libraries

[Alexander Kulyakhtin]

Hi,

Could you, please, review the following test-only changes to the 'jdk', 'hotspot' and the common 'test' repository

http://cr.openjdk.java.net/~akulyakh/8075327/wr_hs/webrev.01/index.html
http://cr.openjdk.java.net/~akulyakh/8075327/wr_jdk/webrev.01/index.html
http://cr.openjdk.java.net/~akulyakh/8075327/wr_test/webrev.01/

The changes are to move test library files common to both jdk and hotspot to the upper-level test repository.

The following has been done:
1) Common files (Asserts.java, OutputAnalyzer.java etc) from the jdk and hotspot repositories,  have been merged and moved to the upper-level common test repository, to test/lib/share/classes. 
2) Package jdk.testlibrary in the jdk repository have been renamed to jdk.test.lib to have the same name as in the hotspot repository
2) Upper level test/lib/share/classes library references have been added to the @library statements
3) Some packages previously located at upper level test repo at /test/lib have been moved to /test/lib/share/classes for consistency

Best regards,
Alexander