A couple of hot fixes for fuel-agent

1) Fix cloud-init meta-data templates

Just meta-data comments layout.

2) Fix repos handling in nailgun drivers

Remove quotes from urls since apt refuses to work with them.

3) Fix ntp.conf issue

Wrong semaphore ids in boothook were wrong
Closes-Bug: #1388042

Implements: blueprint image-based-provisioning
Change-Id: Iad6755753cc1fa938b370016cd2f4026e76b90a3