Use similar interface to access gitolite

Simplified gitolite handle logic
Stubn over monkeypatch
Stub only specific methods in Gitlab:Gitolite
Moved grach auth to lib
added specs for keys observer
removes SshKey role

spec/support/monkeypatch.rb

@@ -1,14 +1,6 @@
 # Stubbing Project <-> git host path
 # create project using Factory only
 class Project
-  def update_repository
-    true
-  end
-
-  def destroy_repository
-    true
-  end
-
   def path_to_repo
     File.join(Rails.root, "tmp", "tests", path)
   end
@@ -18,22 +10,6 @@ class Project
   end
 end
 
-class Key
-  def update_repository
-    true
-  end
-
-  def repository_delete_key
-    true
-  end
-end
-
-class UsersProject
-  def update_repository
-    true
-  end
-end
-
 class FakeSatellite
   def exists?
     true
@@ -43,9 +19,3 @@ class FakeSatellite
     true
   end
 end
-
-class ProtectedBranch
-  def update_repository
-    true
-  end
-end