Adds API routing tests for time entries.

git-svn-id: http://svn.redmine.org/redmine/trunk@13606 e93f8b46-1217-0410-a6f0-8f06a7374b81
Renamed #test_watchers to #test_issue_watchers.

git-svn-id: http://svn.redmine.org/redmine/trunk@13607 e93f8b46-1217-0410-a6f0-8f06a7374b81