This is initial commit of the installer.
What's done:
- verifying node availability before starting any operations.
- gathering information about disks on the machine.
- allows setting: install disk, hostname, machine type, installer image,
kubernetes version, dns domain, cluster-name.
- dumps/merges talosconfig to a file after applying configuration.
Signed-off-by: Artem Chernyshev <artem.0xD2@gmail.com>