RFR: 635: Add census link for credited reviewers [v2]

[Guoxiong Li]

> Hi all,
> 
> This patch uses the full name and the census link of the credited reviewer so that the `### Reviewers` part can be clearer.
> 
> For example, the [PR-6562](https://github.com/openjdk/jdk/pull/6562) has a credited reviewer which is shown as `jbhateja - Committer  Added manually`. 
> 
> After this patch, it will show: `Jatin Bhateja - Committer  Added manually`. The full name `Jatin Bhateja` will replace the username `jbhateja`.
> 
> If these is a census link, it will show: `[Jatin Bhateja](https://openjdk.java.net/census#jbhateja) - Committer  Added manually`.
> 
> And the test cases are added.
> 
> Thanks for taking the time to review.
> 
> Best Regards,
> -- Guoxiong

Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:

  Fix the output message.

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

Changes:
  - all: https://git.openjdk.java.net/skara/pull/1252/files
  - new: https://git.openjdk.java.net/skara/pull/1252/files/2774c8a2..d69c7037

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=1252&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=1252&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/1252.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1252/head:pull/1252

PR: https://git.openjdk.java.net/skara/pull/1252