Add alternative output for isolation_master_update_node

src/test/regress/expected/isolation_master_update_node.out

@@ -47,6 +47,8 @@ step s2-abort: ABORT;
 step s1-abort: ABORT;
 WARNING: this step had a leftover error message
 FATAL:  terminating connection due to administrator command
+FATAL:  terminating connection due to administrator command
+SSL connection has been closed unexpectedly
 server closed the connection unexpectedly
 	This probably means the server terminated abnormally
 	before or while processing the request.

src/test/regress/expected/isolation_master_update_node_0.out

@@ -47,7 +47,9 @@ step s2-abort: ABORT;
 step s1-abort: ABORT;
 WARNING: this step had a leftover error message
 FATAL:  terminating connection due to administrator command
-SSL connection has been closed unexpectedly
+server closed the connection unexpectedly
+	This probably means the server terminated abnormally
+	before or while processing the request.
 
 master_remove_node
 

src/test/regress/expected/isolation_master_update_node_1.out

@@ -0,0 +1,55 @@
+Parsed test spec with 2 sessions
+
+starting permutation: s1-begin s1-insert s2-begin s2-update-node-1 s1-abort s2-abort
+create_distributed_table
+
+
+step s1-begin: BEGIN;
+step s1-insert: INSERT INTO t1 SELECT generate_series(1, 100);
+step s2-begin: BEGIN;
+step s2-update-node-1:
+    -- update a specific node by address
+    SELECT master_update_node(nodeid, 'localhost', nodeport + 10)
+      FROM pg_dist_node
+     WHERE nodename = 'localhost'
+       AND nodeport = 57637;
+ <waiting ...>
+step s1-abort: ABORT;
+step s2-update-node-1: <... completed>
+master_update_node
+
+
+step s2-abort: ABORT;
+master_remove_node
+
+
+
+
+starting permutation: s1-begin s1-insert s2-begin s2-update-node-1-force s2-abort s1-abort
+create_distributed_table
+
+
+step s1-begin: BEGIN;
+step s1-insert: INSERT INTO t1 SELECT generate_series(1, 100);
+step s2-begin: BEGIN;
+step s2-update-node-1-force:
+    -- update a specific node by address (force)
+    SELECT master_update_node(nodeid, 'localhost', nodeport + 10, force => true, lock_cooldown => 100)
+      FROM pg_dist_node
+     WHERE nodename = 'localhost'
+       AND nodeport = 57637;
+ <waiting ...>
+step s2-update-node-1-force: <... completed>
+master_update_node
+
+
+step s2-abort: ABORT;
+step s1-abort: ABORT;
+WARNING: this step had a leftover error message
+FATAL:  terminating connection due to administrator command
+SSL connection has been closed unexpectedly
+
+master_remove_node
+
+
+