Add support for NoCloud metadata provider, where the metadata
is provided on a config-drive (vfat or iso9660) with the label
cidata or CIDATA.
The folder structure for NoCloud is:
* /user-data
* /meta-data
The user-data and meta-data files respect the EC2 metadata
service format.
Supported features for the NoCloud metadata service:
* instance id
* hostname
* plublic keys
* static network configuration (Debian format)
* user data
More information:
cloudinit.readthedocs.io/en/latest/topics/datasources/nocloud.html
Change-Id: Ib434cf2b2b21bf9faa58e05ba40eb0135385c9ea
Implements: blueprint nocloud-metadata-support
4b0d94cd0f