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/gitolite_stub.rb

@@ -0,0 +1,35 @@
+module GitoliteStub
+  def stub_gitolite!
+    stub_gitlab_gitolite
+    stub_gitolite_admin
+  end
+
+  def stub_gitolite_admin
+    gitolite_repo = mock(
+      clean_permissions: true,
+      add_permission: true
+    )
+
+    gitolite_config = mock(
+      add_repo: true,
+      get_repo: gitolite_repo,
+      has_repo?: true
+    )
+
+    gitolite_admin = double(
+      'Gitolite::GitoliteAdmin', 
+      config: gitolite_config,
+      save: true,
+    )
+
+    Gitolite::GitoliteAdmin.stub(new: gitolite_admin)
+
+  end
+
+  def stub_gitlab_gitolite
+    gitlab_gitolite = Gitlab::Gitolite.new
+    Gitlab::Gitolite.stub(new: gitlab_gitolite)
+    gitlab_gitolite.stub(configure: ->() { yield(self) })
+    gitlab_gitolite.stub(update_keys: true)
+  end
+end