[PR] HRW: Add support for elif, in if-elif-else [trafficserver]

[via GitHub]

zwoop opened a new pull request, #12304:
URL: https://github.com/apache/trafficserver/pull/12304

   This adds an elif clause to the conditions. E.g.
   
   ```
   cond %{SEND_RESPONSE_HDR_HOOK} [AND]
   cond %{CLIENT-HEADER:X-Foo} ="foo"
      set-header X-Resp "foo"
   elif
       cond %{CLIENT-HEADER:X-Foo} ="bar"
           set-header X-Resp "bar"
   elif
       cond %{CLIENT-HEADER:X-Foo} ="baz"
           set-header X-Resp "baz"
   else
      set-header X-Resp "else"
   ```
   
   In addition, this cleans up the handling of the existing "else" clause, and 
I ran clang-tidy over the two files I was editing.
   
   Co-author: Miles L.


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