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

app/roles/git_host.rb

@@ -0,0 +1,5 @@
+module GitHost
+  def git_host
+    Gitlab::Gitolite.new
+  end
+end

app/roles/git_merge.rb

@@ -1,2 +0,0 @@
-module GitMerge
-end

app/roles/repository.rb

@@ -1,4 +1,6 @@
 module Repository
+  include GitHost
+
   def valid_repo?
     repo
   rescue
@@ -48,7 +50,7 @@ module Repository
   end
 
   def url_to_repo
-    Gitlab::GitHost.url_to_repo(path)
+    git_host.url_to_repo(path)
   end
 
   def path_to_repo
@@ -56,11 +58,11 @@ module Repository
   end
 
   def update_repository
-    Gitlab::GitHost.system.update_project(path, self)
+    git_host.update_repository(self)
   end
 
   def destroy_repository
-    Gitlab::GitHost.system.destroy_project(self)
+    git_host.remove_repository(self)
   end
 
   def repo_exists?

app/roles/ssh_key.rb

@@ -1,18 +0,0 @@
-module SshKey
-  def update_repository
-    Gitlab::GitHost.system.new.configure do |c|
-      c.update_keys(identifier, key)
-      c.update_projects(projects)
-    end
-  end
-
-  def repository_delete_key
-    Gitlab::GitHost.system.new.configure do |c|
-      #delete key file is there is no identically deploy keys
-      if !is_deploy_key || Key.where(identifier: identifier).count() == 0
-        c.delete_key(identifier)
-      end
-      c.update_projects(projects)
-    end
-  end
-end