Integrated: 7903027: Initial support for Jemmy-based GUI reg tests

[Dmitry Bessonov]

This is to create a new build target (supposedly "test-gui") that would allow to run Jemmy-based UI tests as part of the JTH build/self-check process.

This issue is mostly about implementing the framework for having such Jemmy-based regression tests in the repository. 
Plus integrating few tests at the start as an example.

-------------

Commit messages:
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - 7903027: Initial support for Jemmy-based GUI reg tests
 - ... and 20 more: https://git.openjdk.java.net/jtharness/compare/3e3672d2...04be421c

Changes: https://git.openjdk.java.net/jtharness/pull/13/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jtharness&pr=13&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903027
  Stats: 16568 lines in 113 files changed: 16568 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jtharness/pull/13.diff
  Fetch: git fetch https://git.openjdk.java.net/jtharness pull/13/head:pull/13

PR: https://git.openjdk.java.net/jtharness/pull/13