RFR: 8129778: Few awt test fail for Solaris 11 with RuntimeException

[Alexander Zvegintsev]

Those tests were failing on Solaris, which is no longer supported.

They pass as they are, but decreasing of delays reduce execution time significantly:

e.g. proposed changes drops execution time from ~5min to ~2 min 
for MouseButtonsAndKeyMasksTest on my machine.

Testing is green on all platforms.

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

Commit messages:
 - initial

Changes: https://git.openjdk.java.net/jdk/pull/8339/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8339&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8129778
  Stats: 44 lines in 4 files changed: 22 ins; 6 del; 16 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8339.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8339/head:pull/8339

PR: https://git.openjdk.java.net/jdk/pull/8339