MDEV-13496 Use "mariabackup" rather than "xtrabackup" in console output

extra/mariabackup/changed_page_bitmap.cc

@@ -538,7 +538,7 @@ xb_msg_missing_lsn_data(
 	lsn_t	missing_interval_start,	/*!<in: interval start */
 	lsn_t	missing_interval_end)	/*!<in: interval end */
 {
-	msg("xtrabackup: warning: changed page data missing for LSNs between "
+	msg("mariabackup: warning: changed page data missing for LSNs between "
 	    LSN_PF " and " LSN_PF "\n", missing_interval_start,
 	    missing_interval_end);
 }
@@ -615,7 +615,7 @@ xb_page_bitmap_init(void)
 
 	if (UNIV_UNLIKELY(bmp_start_lsn > bmp_end_lsn)) {
 
-		msg("xtrabackup: incremental backup LSN " LSN_PF
+		msg("mariabackup: incremental backup LSN " LSN_PF
 		    " is larger than than the last checkpoint LSN " LSN_PF
 		    "\n", bmp_start_lsn, bmp_end_lsn);
 		return NULL;
@@ -700,7 +700,7 @@ xb_page_bitmap_init(void)
 						      &current_page_end_lsn,
 						      bmp_start_lsn))) {
 
-		msg("xtrabackup: Warning: changed page bitmap file "
+		msg("mariabackup: Warning: changed page bitmap file "
 		    "\'%s\' corrupted\n", bitmap_file.name);
 		rbt_free(result);
 		free(bitmap_files.files);
@@ -805,7 +805,7 @@ xb_page_bitmap_init(void)
 
 		if (UNIV_UNLIKELY(!last_page_ok)) {
 
-			msg("xtrabackup: warning: changed page bitmap file "
+			msg("mariabackup: warning: changed page bitmap file "
 			    "\'%s\' corrupted.\n", bitmap_file.name);
 			rbt_free(result);
 			free(bitmap_files.files);

extra/mariabackup/wsrep.cc

@@ -195,7 +195,7 @@ xb_write_galera_info(bool incremental_prepare)
 	fp = fopen(XB_GALERA_INFO_FILENAME, "w");
 	if (fp == NULL) {
 
-		msg("xtrabackup: error: "
+		msg("mariabackup: error: "
 		    "could not create " XB_GALERA_INFO_FILENAME
 		    ", errno = %d\n",
 		    errno);
@@ -204,12 +204,12 @@ xb_write_galera_info(bool incremental_prepare)
 
 	seqno = wsrep_xid_seqno(&xid);
 
-	msg("xtrabackup: Recovered WSREP position: %s:%lld\n",
+	msg("mariabackup: Recovered WSREP position: %s:%lld\n",
 	    uuid_str, (long long) seqno);
 
 	if (fprintf(fp, "%s:%lld", uuid_str, (long long) seqno) < 0) {
 
-		msg("xtrabackup: error: "
+		msg("mariabackup: error: "
 		    "could not write to " XB_GALERA_INFO_FILENAME
 		    ", errno = %d\n",
 		    errno);