Make connect/test1 independent of localhost IPv6.

Since commit 8688987, it has assumed
"localhost" resolves to both ::1 and 127.0.0.1.  We gain nothing from
that assumption, and it does not hold in a default installation of Red
Hat Enterprise Linux 5.  Back-patch to 9.3 (all supported versions).

Author: nmisch

src/interfaces/ecpg/test/connect/test1.pgc

@@ -54,7 +54,7 @@ exec sql end declare section;
 	exec sql disconnect;
 
 	/* wrong port */
-	exec sql connect to tcp:postgresql://localhost:20/ecpg2_regression user regress_ecpg_user1 identified by connectpw;
+	exec sql connect to tcp:postgresql://127.0.0.1:20/ecpg2_regression user regress_ecpg_user1 identified by connectpw;
 	/* no disconnect necessary */
 
 	/* wrong password */

src/interfaces/ecpg/test/expected/connect-test1.c

@@ -109,7 +109,7 @@ main(void)
 
 
 	/* wrong port */
-	{ ECPGconnect(__LINE__, 0, "tcp:postgresql://localhost:20/ecpg2_regression" , "regress_ecpg_user1" , "connectpw" , NULL, 0); }
+	{ ECPGconnect(__LINE__, 0, "tcp:postgresql://127.0.0.1:20/ecpg2_regression" , "regress_ecpg_user1" , "connectpw" , NULL, 0); }
 #line 57 "test1.pgc"
 
 	/* no disconnect necessary */

src/interfaces/ecpg/test/expected/connect-test1.stderr

@@ -63,13 +63,10 @@
 [NO_PID]: sqlca: code: -402, state: 08001
 [NO_PID]: raising sqlcode -220 on line 54: connection "CURRENT" does not exist on line 54
 [NO_PID]: sqlca: code: -220, state: 08003
-[NO_PID]: ECPGconnect: opening database ecpg2_regression on localhost port <REGRESSION_PORT>  for user regress_ecpg_user1
+[NO_PID]: ECPGconnect: opening database ecpg2_regression on 127.0.0.1 port <REGRESSION_PORT>  for user regress_ecpg_user1
 [NO_PID]: sqlca: code: 0, state: 00000
 [NO_PID]: ECPGconnect: could not open database: could not connect to server: Connection refused
-	Is the server running on host "localhost" (::1) and accepting
-	TCP/IP connections on port 20?
-could not connect to server: Connection refused
-	Is the server running on host "localhost" (127.0.0.1) and accepting
+	Is the server running on host "127.0.0.1" and accepting
 	TCP/IP connections on port 20?
 
 [NO_PID]: sqlca: code: 0, state: 00000