T3270: Backported all changes from the equuleus branch

The behavior of VyOS modules was almost totally changed. Therefore instead of changes, here is a list of what is supported by new versions:

`cc_vyos.py`:

  - extended logging for debugging purposes
  - work with any environment or datasource
  - all available in VyOS SSH keys (ssh-dss, ssh-rsa, ecdsa-sha2-nistp256, ecdsa-sha2-nistp384, ssh-ed25519, ecdsa-sha2-nistp521) with options
  - both encrypted and plain-text passwords
  - multiple user accounts
  - the fallback user creating (default "vyos/vyos") in credentials are missed in a Meta-Data
  - interfaces configuration using Network-Config v1 or v2
  - fallback interface config (DHCP on eth0) if Network-config is not available
  - both IPv4 and IPv6 addresses in Network-Config
  - MTU, multiple addresses, DHCP or static addresses, gateway, routes, DNS nameserver, DNS search domain in Network-Config
  - filtration of a hostname value from metadata
  - VyOS-specific options from the OVF template
  - automatically enabling SSH server

`cc_vyos_userdata.py`:

set and delete configuration commands inside the User-Data (#cloud-config). See details: https://github.com/vyos/vyos-cloud-init/commit/1607eec32641ad93ea211e447336b3366c28de06

Configuration template:

  - enabled `write_files` module
  - disabled the `runcmd` module (functionality replaced by `cc_vyos_userdata.py` and `write_files`)

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