KNOX-2321 - HDFS UI rewrite rules should handle LogLevel

[lokeshj1703]

https://issues.apache.org/jira/browse/KNOX-2321

What changes were proposed in this pull request?

Add a rewrite rule for LogLevel in hdfs ui.

How was this patch tested?

The patch was tested on a cluster.

[bharatviswa504]

This link is added to DN and explorer page also, do we need some changes for Dn and explorer rewrite rules also to make it work?

[moresandeep]

This link is added to DN and explorer page also, do we need some changes for Dn and explorer rewrite rules also to make it work?

We probably, should, @lokeshj1703 thoughts?

[lmccay]

Would the other UIs be addressed via global rewrite rules by any chance?

[moresandeep]

Would the other UIs be addressed via global rewrite rules by any chance?

Global rewrite rule is a double edge sword, it might break other UIs unknowingly. I think some code duplication might be tolerable in this case.

[lmccay]

Okay - I want to cut an RC in the next day or so - so let's get this resolved.

[moresandeep]

Ah right, I'll merge this and we will followup with new JIRA if needed.

[lokeshj1703]

@bharatviswa504 @moresandeep I think it should be fine. The rewrite rules are added under section.
<!-- outbound rewrite rules for links under utilities -->
I think these rewrite rules apply for datanode as well as explorer html.