replication: print master uuid when (re)bootstrapping

Currently only the remote address is printed. Let's also print the UUID,
because replicas are identified by UUID everywhere in tarantool, not by
the address. An example of the output is below:

  I> can't follow eb81a67e-99ee-40bb-8601-99b03fa20124 at [::1]:58083: required {1: 8} available {1: 12}
  C> replica is too old, initiating rebootstrap
  I> bootstrapping replica from eb81a67e-99ee-40bb-8601-99b03fa20124 at [::1]:58083

  I> can't follow eb81a67e-99ee-40bb-8601-99b03fa20124 at [::1]:58083: required {1: 17, 2: 1} available {1: 20}
  I> can't rebootstrap from eb81a67e-99ee-40bb-8601-99b03fa20124 at [::1]:58083: replica has local rows: local {1: 17, 2: 1} remote {1: 23}
  I> recovery start

Suggested by @kostja.

Follow-up ea69a0cd ("replication: rebootstrap instance on startup
if it fell behind").

src/box/box.cc

@@ -1703,7 +1703,8 @@ bootstrap_from_master(struct replica *master)
 	applier_resume_to_state(applier, APPLIER_READY, TIMEOUT_INFINITY);
 	assert(applier->state == APPLIER_READY);
 
-	say_info("bootstrapping replica from %s",
+	say_info("bootstrapping replica from %s at %s",
+		 tt_uuid_str(&master->uuid),
 		 sio_strfaddr(&applier->addr, applier->addr_len));
 
 	/*

src/box/replication.cc

@@ -659,14 +659,15 @@ replicaset_needs_rejoin(struct replica **master)
 			return false;
 		}
 
+		const char *uuid_str = tt_uuid_str(&replica->uuid);
 		const char *addr_str = sio_strfaddr(&applier->addr,
 						applier->addr_len);
 		char *local_vclock_str = vclock_to_string(&replicaset.vclock);
 		char *remote_vclock_str = vclock_to_string(&ballot->vclock);
 		char *gc_vclock_str = vclock_to_string(&ballot->gc_vclock);
 
-		say_info("can't follow %s: required %s available %s",
-			 addr_str, local_vclock_str, gc_vclock_str);
+		say_info("can't follow %s at %s: required %s available %s",
+			 uuid_str, addr_str, local_vclock_str, gc_vclock_str);
 
 		if (vclock_compare(&replicaset.vclock, &ballot->vclock) > 0) {
 			/*
@@ -674,9 +675,10 @@ replicaset_needs_rejoin(struct replica **master)
 			 * the master. Don't rebootstrap as we don't want
 			 * to lose any data.
 			 */
-			say_info("can't rebootstrap from %s: "
+			say_info("can't rebootstrap from %s at %s: "
 				 "replica has local rows: local %s remote %s",
-				 addr_str, local_vclock_str, remote_vclock_str);
+				 uuid_str, addr_str, local_vclock_str,
+				 remote_vclock_str);
 			goto next;
 		}