Fix typo for git mirroring jobs and remove useless 2ways pipelines

Change-Id: I7b316d70704f3a44c68277fc641957daae2ae21e
diff --git a/jenkins/client/job/git-mirrors/2way.yml b/jenkins/client/job/git-mirrors/2way.yml
index aa56cfc..b472fa1 100644
--- a/jenkins/client/job/git-mirrors/2way.yml
+++ b/jenkins/client/job/git-mirrors/2way.yml
@@ -36,7 +36,7 @@
                 default: "${_param:jenkins_gerrit_url}/{{source}}.git"
               TARGET_URL:
                 type: string
-                default: "https://github.com/{{target}}.git"
+                default: "git@github.com:{{target}}.git"
               CREDENTIALS_ID:
                 type: string
                 default: "gerrit"