Force the regression databases to have bytea_output set to hex

Even if the installation defaults to escape output, this makes
pg_regress make the setting hex, so that installcheck tests can pass in
such a setting.

Jeff Janes.

Discussion: http://postgr.es/m/CAMkU=1xivkTNeyCfzhwdHJ+VH5qpU+4gsipRNuEUbyQf+KN3Kw@mail.gmail.com

src/test/regress/pg_regress.c

@@ -1933,8 +1933,9 @@ create_database(const char *dbname)
 				 "ALTER DATABASE \"%s\" SET lc_monetary TO 'C';"
 				 "ALTER DATABASE \"%s\" SET lc_numeric TO 'C';"
 				 "ALTER DATABASE \"%s\" SET lc_time TO 'C';"
+				 "ALTER DATABASE \"%s\" SET bytea_output TO 'hex';"
 			"ALTER DATABASE \"%s\" SET timezone_abbreviations TO 'Default';",
-				 dbname, dbname, dbname, dbname, dbname);
+				 dbname, dbname, dbname, dbname, dbname, dbname);
 
 	/*
 	 * Install any requested procedural languages.  We use CREATE OR REPLACE