change connection setup so that there would always be an available database

Author: Tianyi Chen

test/network/exception_test.cpp

@@ -41,7 +41,7 @@ void *ParserExceptionTest(int port) {
   try {
     // forcing the factory to generate psql protocol handler
     pqxx::connection C(StringUtil::Format(
-        "host=127.0.0.1 port=%d user=postgres sslmode=disable application_name=psql", port));
+        "host=127.0.0.1 port=%d user=default_database sslmode=disable application_name=psql", port));
 
     peloton::network::ConnectionHandle *conn =
         peloton::network::ConnectionHandleFactory::GetInstance().ConnectionHandleAt(

test/network/prepare_stmt_test.cpp

@@ -37,7 +37,7 @@ void *PrepareStatementTest(int port) {
   try {
     // forcing the factory to generate jdbc protocol handler
     pqxx::connection C(StringUtil::Format(
-        "host=127.0.0.1 port=%d user=postgres sslmode=disable", port));
+        "host=127.0.0.1 port=%d user=default_database sslmode=disable", port));
     LOG_INFO("[PrepareStatementTest] Connected to %s", C.dbname());
     pqxx::work txn1(C);
 

test/network/select_all_test.cpp

@@ -38,7 +38,7 @@ void *SelectAllTest(int port) {
   try {
     // forcing the factory to generate psql protocol handler
     pqxx::connection C(StringUtil::Format(
-        "host=127.0.0.1 port=%d user=postgres sslmode=disable application_name=psql", port));
+        "host=127.0.0.1 port=%d user=default_database sslmode=disable application_name=psql", port));
     pqxx::work txn1(C);
     peloton::network::ConnectionHandle *conn =
         peloton::network::ConnectionHandleFactory::GetInstance().ConnectionHandleAt(

test/network/simple_query_test.cpp

@@ -38,7 +38,7 @@ void *SimpleQueryTest(int port) {
   try {
     // forcing the factory to generate psql protocol handler
     pqxx::connection C(StringUtil::Format(
-        "host=127.0.0.1 port=%d user=postgres sslmode=disable application_name=psql", port));
+        "host=127.0.0.1 port=%d user=default_database sslmode=disable application_name=psql", port));
     pqxx::work txn1(C);
 
     peloton::network::ConnectionHandle *conn =

test/network/ssl_test.cpp

@@ -39,7 +39,7 @@ void *BasicTest(int port) {
   try {
     // forcing the factory to generate psql protocol handler
     pqxx::connection C(StringUtil::Format(
-        "host=127.0.0.1 port=%d user=postgres application_name=psql sslmode=require", port));
+        "host=127.0.0.1 port=%d user=default_database application_name=psql sslmode=require", port));
     pqxx::work txn1(C);
 
     peloton::network::ConnectionHandle *conn =