REST API: Fix test failures.

- Fix leak in setup_notify_comment() test help by removing the comment_flood_filter.
- Correct uses of $term_taxonomy_id -> $term_id in Category and Tags routing.
- Temporarily remove the metadata tests for canola.jpg as that file does not have an exifdata.  Will need to update the test.

Props jorbin, rmccue, nacin
See #38373.
Built from https://develop.svn.wordpress.org/trunk@38834


git-svn-id: http://core.svn.wordpress.org/trunk@38777 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7-alpha-38833';
+$wp_version = '4.7-alpha-38834';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.