[11] RFR (XS) 8193838: Update jtreg requiredVersion to 4.2 b11 for JDK 11 and 12 support

[David Holmes]

Before we can update to JDK version 11, jtreg needs to be updated to 
recognize that release value - which is happening in jtreg 4.2 b11. So 
we then need to ensure that jtreg 4.2 b11 is used by updating the 
requiredVersion in each of the TEST.ROOT files, and in the jib 
configuiration.

bug: https://bugs.openjdk.java.net/browse/JDK-8193838
webrev: http://cr.openjdk.java.net/~dholmes/8193838/webrev/

Testing - TBD once b11 is promoted
  - local build using jib
  - hs/jdk tier1 and tier2

Thanks,
David