create: add template for non-vshard cluster

[elhimov]

Configurable parameters:

• Number of replicasets
• Number of replicas per replicaset
• User name
• Password

Example of generated config

Number of replicasets: 2
Number of replicas per replicaset: 3
User: me
Password: bla-BLA-bla

instances.yaml

---
replicaset-001-a:
replicaset-001-b:
replicaset-001-c:
replicaset-002-a:
replicaset-002-b:
replicaset-002-c:

config.yaml

credentials:
  users:
    me:
      password: 'bla-BLA-bla'
      roles: [super]
    replicator:
      password: 'topsecret'
      roles: [replication]

iproto:
  advertise:
    peer:
      login: replicator

replication:
  failover: manual

groups:
  group-001:
    app:
      file: 'app.lua'
    replicasets:
      replicaset-001:
        leader: replicaset-001-a
        instances:
          replicaset-001-a:
            iproto:
              listen:
              - uri: 127.0.0.1:3301
          replicaset-001-b:
            iproto:
              listen:
              - uri: 127.0.0.1:3302
          replicaset-001-c:
            iproto:
              listen:
              - uri: 127.0.0.1:3303
      replicaset-002:
        leader: replicaset-002-a
        instances:
          replicaset-002-a:
            iproto:
              listen:
              - uri: 127.0.0.1:3304
          replicaset-002-b:
            iproto:
              listen:
              - uri: 127.0.0.1:3305
          replicaset-002-c:
            iproto:
              listen:
              - uri: 127.0.0.1:3306

I didn't forget about:

• Well-written commit messages (see documentation how to write a commit message)
• Don't forget about TarantoolBot in a commit message (see example)
• Tests (see documentation for a testing package)
• Changelog (see documentation for changelog format)

Related issues:

Closes #1182

[oleg-jukovec]

Please, add an example of execution of the command (into PR and commit messages) and generated config (into PR message).

[oleg-jukovec]

Please, rebase on the master branch.

[elhimov]

Please, add an example of execution of the command (into PR and commit messages) and generated config (into PR message).
Done.

[elhimov]

Please, rebase on the master branch.

Done.