Disable bug id checking through jcheck

[Omair Majid]

Hi,

Webrev at:
http://cr.openjdk.java.net/~omajid/webrevs/ignore-jdk6-bugids/00/

Following the earlier discussion [1] where it was suggested that it
would be nice to be able to use both Oracle bug ids (for backports from
jdk7 and jdk8 projects) and OPENJDK6 bug ids, I got a push fixed to
jcheck that adds this capability to jcheck [2]. Now jcheck can,
optionally, recognize both Oracle-style and JIRA-style bug ids, but
ignore them when checking for duplicates. The webrev turns on this
option for jcheck for the jdk6 project.

Any thoughts, concerns or suggestions?

Thanks,
Omair

[1] http://mail.openjdk.java.net/pipermail/jdk6-dev/2013-March/002922.html
[2] http://hg.openjdk.java.net/code-tools/jcheck/rev/73390716f288
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