RFR: 8024201 : (xs) Change bug database URL

[Mike Duigou]

Hello all;

The base url for the openjdk bug database was recently changed. This changeset 
ensures that webrev generates correct urls for the bugs it links to.

http://cr.openjdk.java.net/~mduigou/JDK-8024201/0/

Cheers!

Mike