storage: export name to info

When named config is used, there may be no UUIDs specified for
replicas and replicasets. Consequently, in such case we must
also show the names in addition to UUIDs in storage.info().

Part of #426

@TarantoolBot document
Title: vshard: vshard.storage.info shows name

When `identification_mode` is `name_as_key`, persisted master and
replicaset name is shown in vshard.storage.info:

```
tarantool> vshard.storage.info()
---
- replicasets:
    replicaset_1:
      name: replicaset_1
      master:
        uri: admin@localhost:3302
        name: replica_1_a
  ...
```

test/storage-luatest/storage_1_1_test.lua

@@ -544,6 +544,10 @@ test_group.test_named_config_identification = function(g)
 
  -- Attempt to configure with named config without name set causes error.
  g.replica_1_a:exec(function(cfg)
+ -- Name is not shown in info, when uuid identification is used.
+ local rs = ivshard.storage.info().replicasets[ivutil.replicaset_uuid()]
+ ilt.assert_equals(rs.name, nil)
+ ilt.assert_equals(rs.master.name, nil)
  ilt.assert_error_msg_contains('Instance name mismatch',
  ivshard.storage.cfg, cfg, 'replica_1_a')
  end, {new_global_cfg})
@@ -574,6 +578,12 @@ test_group.test_named_config_identification = function(g)
  local rs_name_2 = g.replica_2_a:replicaset_name()
  t.assert_equals(rs_name_2, 'replicaset_2')
  local bid = g.replica_1_a:exec(function(name)
+ -- Name is shown, when name identification is used.
+ local rs = ivshard.storage.info().replicasets[box.info.replicaset.name]
+ ilt.assert_equals(rs.name, box.info.replicaset.name)
+ ilt.assert_equals(rs.uuid, nil)
+ ilt.assert_equals(rs.master.name, box.info.name)
+
  local bid = _G.get_first_bucket()
  local ok, err = ivshard.storage.bucket_send(
  bid, name, {timeout = _G.iwait_timeout})

test/storage/storage.result

@@ -106,15 +106,15 @@ _ = test_run:switch('storage_1_a')
 ...
 vshard.storage.info().replicasets[util.replicasets[1]] or vshard.storage.info()
 ---
-- uuid: <replicaset_1>
- master:
+- master:
  uri: storage@127.0.0.1:3301
+ uuid: <replicaset_1>
 ...
 vshard.storage.info().replicasets[util.replicasets[2]] or vshard.storage.info()
 ---
-- uuid: <replicaset_2>
- master:
+- master:
  uri: storage@127.0.0.1:3303
+ uuid: <replicaset_2>
 ...
 -- Try to call info on a replicaset with no master.
 rs1 = vshard.storage.internal.replicasets[util.replicasets[1]]
@@ -137,12 +137,12 @@ vshard.storage.info()
 ---
 - replicasets:
  <replicaset_2>:
- uuid: <replicaset_2>
  master:
  uri: storage@127.0.0.1:3303
+ uuid: <replicaset_2>
  <replicaset_1>:
- uuid: <replicaset_1>
  master: missing
+ uuid: <replicaset_1>
  bucket:
  receiving: 0
  active: 0
@@ -257,13 +257,13 @@ vshard.storage.info()
 ---
 - replicasets:
  <replicaset_2>:
- uuid: <replicaset_2>
  master:
  uri: storage@127.0.0.1:3303
+ uuid: <replicaset_2>
  <replicaset_1>:
- uuid: <replicaset_1>
  master:
  uri: storage@127.0.0.1:3301
+ uuid: <replicaset_1>
  bucket:
  receiving: 0
  active: 2
@@ -313,17 +313,17 @@ info
 ---
 - replicasets:
  <replicaset_2>:
- uuid: <replicaset_2>
  master:
- state: active
  uri: storage@127.0.0.1:3303
+ state: active
  uuid: <storage_2_a>
+ uuid: <replicaset_2>
  <replicaset_1>:
- uuid: <replicaset_1>
  master:
- state: active
  uri: storage@127.0.0.1:3301
+ state: active
  uuid: <storage_1_a>
+ uuid: <replicaset_1>
  bucket:
  receiving: 0
  active: 2
@@ -343,17 +343,17 @@ vshard.storage.info()
 ---
 - replicasets:
  <replicaset_2>:
- uuid: <replicaset_2>
  master:
- state: active
  uri: storage@127.0.0.1:3303
+ state: active
  uuid: <storage_2_a>
+ uuid: <replicaset_2>
  <replicaset_1>:
- uuid: <replicaset_1>
  master:
- state: active
  uri: storage@127.0.0.1:3301
+ state: active
  uuid: <storage_1_a>
+ uuid: <replicaset_1>
  bucket:
  receiving: 0
  active: 2
@@ -378,13 +378,13 @@ vshard.storage.info()
 ---
 - replicasets:
  <replicaset_2>:
- uuid: <replicaset_2>
  master:
  uri: storage@127.0.0.1:3303
+ uuid: <replicaset_2>
  <replicaset_1>:
- uuid: <replicaset_1>
  master:
  uri: storage@127.0.0.1:3301
+ uuid: <replicaset_1>
  bucket:
  receiving: 0
  active: 2
@@ -405,17 +405,17 @@ vshard.storage.info()
 ---
 - replicasets:
  <replicaset_2>:
- uuid: <replicaset_2>
  master:
- state: active
  uri: storage@127.0.0.1:3303
+ state: active
  uuid: <storage_2_a>
+ uuid: <replicaset_2>
  <replicaset_1>:
- uuid: <replicaset_1>
  master:
- state: active
  uri: storage@127.0.0.1:3301
+ state: active
  uuid: <storage_1_a>
+ uuid: <replicaset_1>
  bucket:
  receiving: 0
  active: 2

vshard/storage/init.lua

@@ -3876,11 +3876,13 @@ local function storage_info(opts)
  local conn = master.conn
  master_info = {
  uri = uri, uuid = conn and conn.peer_uuid,
+ name = is_named and master.name or nil,
  state = conn and conn.state, error = conn and conn.error,
  }
  end
  ireplicasets[id] = {
  uuid = replicaset.uuid,
+ name = is_named and replicaset.name or nil,
  master = master_info,
  }
  end