backport rails-4.1 r13296 to trunk

Add missing fixtures.

git-svn-id: http://svn.redmine.org/redmine/trunk@13301 e93f8b46-1217-0410-a6f0-8f06a7374b81
add missing fixtures to test/unit/journal_test.rb

git-svn-id: http://svn.redmine.org/redmine/trunk@13302 e93f8b46-1217-0410-a6f0-8f06a7374b81
remove unneeded statement from Issue#parent_issue_id=

git-svn-id: http://svn.redmine.org/redmine/trunk@13303 e93f8b46-1217-0410-a6f0-8f06a7374b81