Force heat_local collector on seed first boot

Although is configured on the config.json file to only use heat_local
collector in os-collect-config, this will not be applied until a
first os-apply-config execution, so on the first boot of the seed node
it will try to get the metadata from heat and ec2 and wait to them
to timeout.

Change-Id: I40e6680ef7f69e8f2319caa7e91cef5529cb3741
Merge "Force heat_local collector on seed first boot"