RFR: 8041267 : (s) Add filtering capability to CacheFind

[Mike Duigou]

Hello all;

In some cases the results of find operations need to be more specific. Adding a filter capability to the find/caching stage would reduce the overhead of some requests. This changeset adds an optional second parameter allowing a find expression to provide additional filtering of find results.

JBSBUG: https://bugs.openjdk.java.net/browse/JDK-8041267
WEBREV: http://cr.openjdk.java.net/~mduigou/JDK-8041267/0/webrev/

Once the functionality is available it will be used in CreateJars.gmk, GensrcProperties.gmk, and Images.gmk to narrow find results.

Mike