RFR(s): 8167494: Deprecate AutoGCSelectPauseMillis

[sangheon]

Hi all,

Can I have some reviews for this patch of deprecating 
AutoGCSelectPauseMillis command-line option?

As UseAutoGCSelectPolicy will be deprecated in JDK 9, 
AutoGCSelectPauseMillis which functions together with it, should be 
deprecated too.
And AutoGCSelectPauseMillis should be addressed within "JDK-8166461: 
Deprecate UseAutoGCSelectPolicy", but it didn't. This is a sub-task of 
JDK-8166461 and the patch is based on the patch of JDK-8166461.

This patch includes adding a deprecation message for 
AutoGCSelectPauseMillis option and a modification for existing test.

CR: https://bugs.openjdk.java.net/browse/JDK-8167494
Webrev: http://cr.openjdk.java.net/~sangheki/8167494/webrev.0/
Test: JPRT

Thanks,
Sangheon