Test conf.parsoid.apiURI instead of conf.wiki.apiURI

* "echo '<math>3</math>' | node parse" was not parsing extension
  output whereas "... | node parse --fetchConfig" was doing this.

* Turned out that the extension and template handlers were still
  testing the wrong URI before making api requests.

* Fixes commandline parser tests.

Change-Id: I0703fe39dafba4c9a5a4db3c9f4ccf00ffa876a3
Merge "Test conf.parsoid.apiURI instead of conf.wiki.apiURI"