Merge pull request #1980 from edx/feanil/update_cert_git_url

Update cert url.

playbooks/edx-east/legacy_certificates.yml

@@ -5,7 +5,7 @@
   gather_facts: True
   vars:
     serial_count: 1
-    repo_url: "git@github.com/edx/certificates.git"
+    repo_url: "git@github.com:edx/certificates.git"
     repo_path: "/opt/wwc/certificates"
     certificates_version: "master"
     git_ssh_script: "/opt/wwc/git.sh"