Merge pull request #4129 from edx/youngstrom/jenkins_credential_ids

jenkins_common: Add credential id for ssh template

playbooks/roles/jenkins_common/templates/config/credentials.yml.j2

@@ -37,6 +37,7 @@
   isJenkinsMasterSsh: true
   passphrase: '{{ master_ssh.passphrase }}'
   description: '{{ master_ssh.description }}'
+  id: '{{ master_ssh.id }}'
 {% endfor %}
 {% for custom_ssh in JENKINS_CUSTOM_SSH_LIST %}
 - credentialType: 'ssh'
@@ -46,4 +47,5 @@
   path: 'credentials/{{ custom_ssh.name }}'
   passphrase: '{{ custom_ssh.passphrase }}'
   description: '{{ custom_ssh.description }}'
+  id: '{{ custom_ssh.id }}'
 {% endfor %}