RFR(S) : 8056072 : add jprt_optimized targets

[Igor Ignatyev]

http://cr.openjdk.java.net/~iignatyev/8056072/webrev.00/
27 lines changed: 23 ins; 0 del; 4 mod;

Hi all,

Please review the patch which adds jprt_build_optimized* targets and 
removes mentions of optimized builds from 'jprt.properties'.

jbs: https://bugs.openjdk.java.net/browse/JDK-8056072

PS the platforms to build w/ optimized flavor will be selected and added 
into jprt.properties as the fix for JDK-8013869 after corresponding 
changes in JPRT.
-- 
Igor