RFR (XS) 811126: Set update release to 8u66 and keep default jprt release as 8u60 on jdk8u repos

[Alejandro E Murillo]

Please review the following change for
https://bugs.openjdk.java.net/browse/JDK-8131126
Set update release to 8u66 and keep default jprt release as 8u60 on 
jdk8u repos

webrev: http://cr.openjdk.java.net/~amurillo/8u66/8131126/

Thanks

-- 
Alejandro