RFR: JDK-8215568: Refactor SA clhsdb tests to use ClhsdbLauncher

[Jini George]

Hello!

Requesting reviews for:

http://cr.openjdk.java.net/~jgeorge/8215568/webrev.00/

BugID: https://bugs.openjdk.java.net/browse/JDK-8215568

No new failures with the SA tests (hs-tiers 1-5) with these changes. The 
changes here include:

* Refactoring the SA tests which test clhsdb commands to use 
ClhsdbLauncher for uniformity and ease of maintainence.
* Testing for regular expressions with shouldMatch rather than 
shouldContain.
* Minor cleanups.

Thank you,
Jini.