iproto: add new keys to Binary protocol section (#3433)

* Added IPROTO_VCLOCK_SYNC key. Updated vclock keys description. Updated heartbeats' description and byte codes.
* Renamed CLUSTER_UUID key to REPLICASET_UUID.
* Added IPROTO_BALLOT_BOOTSTRAP_LEADER_UUID and IPROTO_BALLOT_REGISTERED_REPLICA_UUIDS keys. Updated IPROTO_BALLOT description.
* Updated IPROTO_TERM key, updated heartbeats' description and byte codes.

Resolves #3166
Resolves #3294
Resolves #3193
Resolves #3299

Author: xuniq

doc/dev_guide/internals/iproto/images/repl_ballot.puml

@@ -8,13 +8,15 @@ skinparam {
 }
 
 json "**IPROTO_BALLOT body**" as ballot {
-    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_BALLOT_IS_RO_CFG]]": "MP_BOOL",
-    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_BALLOT_VCLOCK]]": "MP_MAP",
-    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_BALLOT_GC_VCLOCK]]": "MP_MAP",
-    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_BALLOT_IS_RO]]": "MP_BOOL",
-    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_BALLOT_IS_ANON]]": "MP_BOOL",
-    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_BALLOT_IS_BOOTED]]": "MP_BOOL",
-    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys IPROTO_BALLOT_CAN_LEAD]]": "MP_BOOL"
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_IS_RO_CFG]]": "MP_BOOL",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_VCLOCK]]": "MP_MAP",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_GC_VCLOCK]]": "MP_MAP",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_IS_RO]]": "MP_BOOL",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_IS_ANON]]": "MP_BOOL",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_IS_BOOTED]]": "MP_BOOL",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_CAN_LEAD]]": "MP_BOOL",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_BOOTSTRAP_LEADER_UUID]]": "MP_STR",
+    "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_BALLOT_REGISTERED_REPLICA_UUIDS]]": "MP_ARRAY"
 }
 
 @enduml

doc/dev_guide/internals/iproto/images/repl_ballot.svg

@@ -0,0 +1,22 @@
+@startuml
+
+skinparam {
+    HyperlinkColor #0077FF
+    FontColor #313131
+    BorderColor #313131
+    BackgroundColor transparent
+}
+
+json "**Heartbeat message from master**" as heartbeat_request {
+    "Size": "MP_UINT",
+    "Header": {
+      "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general IPROTO_REQUEST_TYPE]]": "IPROTO_OK",
+      "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_REPLICA_ID]]": "MP_UINT",
+      "[[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general IPROTO_TIMESTAMP]]": "MP_DOUBLE"
+    },
+    "Body": {
+      "(Optional) [[https://tarantool.io/en/doc/latest/dev_guide/internals/iproto/keys/#general-replication IPROTO_VCLOCK_SYNC]]": "MP_UINT"
+    }
+}
+
+@enduml