Make CRUD select error message more clearer.

[psergee]

There is a difference between error description for select and other CRUD calls in case of CRUD storage unavailability.

crud.get('profile', 1)
---
- null
- line: 128
  class_name: GetError
  err: "Failed to call get on storage-side: CallError: Failed for 50b73728-f3e5-4363-bfaa-011beef0d20c:
    Function returned an error: NotInitialized: crud isn't initialized on replicaset:
    \"nil\"\nstack traceback:\n\t...ge_app/myapp/.rocks/share/tarantool/crud/common/call.lua:52:

crud.select('profile')
---
- null
- line: 173
  class_name: SelectError
  err: Procedure '_crud.select_on_storage' is not defined
  file: '...app/.rocks/share/tarantool/crud/common/sharding/init.lua'
  stack: "stack traceback:\n\t...app/.rocks/share/tarantool/crud/common/sharding/init.lua:173:

The select error description does not give any clues what might be the cause of this error.
Here is the updated error text:

crud.get('profile', 1)
---
- null
- line: 128
  class_name: GetError
  err: "Failed to call get on storage-side: CallError: Failed for 50b73728-f3e5-4363-bfaa-011beef0d20c:
    Function returned an error: NotInitialized: crud isn't initialized on replicaset:
    \"50b73728-f3e5-4363-bfaa-011beef0d20c\"\nstack traceback:\n\t...e_app/myapp/.rocks/share/tarantool/crud/common/utils.lua:701:

crud.select('profile')
---
- null
- line: 173
  class_name: SelectError
  err: "NotInitialized: crud isn't initialized on replicaset: \"50b73728-f3e5-4363-bfaa-011beef0d20c\"\nstack
    traceback:\n\t...e_app/myapp/.rocks/share/tarantool/crud/common/utils.lua:701:

The new error description for select also contains information about replicaset id.
Additionally, nil replicaset id is fixed in error messages for single calls: get, delete, etc.

See also #229

[DifferentialOrange]

Should be LGTM after fixing some minor things:

• please, squash commits and make them more informative (see doc 1 and doc 2, repo commit messages as an example);
• I think it's worth to add a CHANGELOG entry

[DifferentialOrange]

Thank you for the update. Should be LGTM after resolving remaining minor things]

[DifferentialOrange]

LGTM after last fix and rebase onto master