Using datacenter as zone

[lowitea]

Proof of concept

[avprotsenko]

Cluster topology:

---
topology:
  - name: router
    replicasets_count: 2
    failure_domains: [router-1-1, router-2-1]
    roles:
      - ttc.roles.router
      - failover-coordinator
  - name: storage
    replicasets_count: 2
    replication_factor: 2
    failure_domains: [storage-1-1, storage-2-1]
    roles:
      - ttc.roles.storage
hosts:
  - name: DC1
    config:
      http_port: 8081
      binary_port: 3031
    hosts:
      - name: router-1-1
        hosts:
          - name: c1-rt1
            config:
              address: 192.168.137.3
      - name: storage-1-1
        hosts:
          - name: c1-db1
            config:
              address: 192.168.137.4
  - name: DC2
    config:
      http_port: 8081
      binary_port: 3031
    hosts:
      - name: router-2-1
        hosts:
          - name: c2-rt1
            config:
              address: 192.168.137.13
      - name: storage-2-1
        hosts:
          - name: c2-db1
            config:
              address: 192.168.137.14
failover:
  mode: disabled
vars:
  ansible_user: vagrant
  ansible_password: vagrant
  cartridge_app_name: app
  cartridge_cluster_cookie: cookie
  cartridge_package_path: "../app.tar.gz"

Steps to reproduce:

genin upgrade --old cluster.genin.old.yml --new cluster.genin.new.yml --fd-as-zone
genin upgrade --from-latest-state --new cluster.genin.new.yml -f --fd-as-zone

Error:

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: GeninError { err_kind: UnknownFailureDomain, err: "none of the hosts [c1-rt1 ] are eligible for the failure domain [router-1-1]" }', src/task/cluster/hst/v2.rs:283:55
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

[alrsorokin]

Closes #157
Комментарий Алексея чинит PR #156