RFR: 2272: Improve issuestitleCheck [v2]

[Zhao Song]

> IssuestitleCheck was enabled in jdk recently, but this seems triggers too many false positive warnings and makes people feel annoying.
> 
> In this patch, I am trying to make the issuestitle check more tolerant. For some known cases, issuestitle check wouldn't generate issues.

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  add : in regex

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1653/files
  - new: https://git.openjdk.org/skara/pull/1653/files/d3a9bb3e..9b0dcc3b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1653&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1653&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1653.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1653/head:pull/1653

PR: https://git.openjdk.org/skara/pull/1653