Reverts r12669 and add a test for #15870.

git-svn-id: http://svn.redmine.org/redmine/trunk@12739 e93f8b46-1217-0410-a6f0-8f06a7374b81
Removed debug output.

git-svn-id: http://svn.redmine.org/redmine/trunk@12740 e93f8b46-1217-0410-a6f0-8f06a7374b81
fix source indent of Redmine::Scm::Adapters::AbstractAdapter#without_trailling_slash

git-svn-id: http://svn.redmine.org/redmine/trunk@12741 e93f8b46-1217-0410-a6f0-8f06a7374b81
code format clean up Repository::Git model

git-svn-id: http://svn.redmine.org/redmine/trunk@12742 e93f8b46-1217-0410-a6f0-8f06a7374b81
remove unneeded Relation#all from Repository::Git model

git-svn-id: http://svn.redmine.org/redmine/trunk@12743 e93f8b46-1217-0410-a6f0-8f06a7374b81