Bring in baremetal support

Bring in baremetal support

- ci/deploy.sh: fail if default scenario file is missing;
- start by copying reclass/classes/cluster/virtual-mcp-ocata-ovs as
  classes/cluster/baremetal-mcp-ocata-ovs;
- add new state (maas) that will handle MaaS configuration;
- Split PXE network in two for baremetal:
  * rename old "pxe" virtual network to "mcpcontrol", make it
    non-configurable and identical for baremetal/virtual deploys;
  * new "pxebr" bridge is dedicated for MaaS fabric network, which
    comes with its own DHCP, TFTP etc.;
- Drop hardcoded PXE gateway & static IP for MaaS node, since
  "mcpcontrol" remains a NAT-ed virtual network, with its own DHCP;
- Keep internet access available on first interfaces for cfg01/mas01;
- Align MaaS IP addrs (all x.y.z.3), add public IP for easy debug
  via MaaS dashboard;
- Add static IP in new network segment (192.168.11.3/24) on MaaS
  node's PXE interface;
- Set MaaS PXE interface MTU 1500 (weird network errors with jumbo);
- MaaS node: Add NAT iptables traffic forward from "mcpcontrol" to
  "pxebr" interfaces;
- MaaS: Add harcoded lf-pod2 machine info (fixed identation in v6);
- Switch our targeted scenario to HA;
  * scenario: s/os-nosdn-nofeature-noha/os-nosdn-nofeature-ha/
- maas region: Use mcp.rsa.pub from ~ubuntu/.ssh/authorized_keys;
- add route for 192.168.11.0/24 via mas01 on cfg01;
- fix race condition on kvm nodes network setup:
  * add "noifupdown" support in salt formula for linux.network;
  * keep primary eth/br-mgmt unconfigured till reboot;

TODO:
- Read all this info from PDF (Pod Descriptor File) later;
- investigate leftover references to eno2, eth3;
- add public network interfaces config, IPs;
- improve wait conditions for MaaS commision/deploy;
- report upstream breakage in system.single;

Change-Id: Ie8dd584b140991d2bd992acdfe47f5644bf51409
Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>
Signed-off-by: Guillermo Herrero <Guillermo.Herrero@enea.com>
Signed-off-by: Charalampos Kominos <Charalampos.Kominos@enea.com>
Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>