MXS-2265: Fix formatting of the zero timestamp

The UNIX timestamp 0 should be treated as a special value and must be
interpreted as 0-00-00 00:00:00 instead of 1970-01-01 00:00:00.

maxscale-system-test/cdc_datatypes/cdc_datatypes.cpp

@@ -99,8 +99,6 @@ static const char* datetime_types[] =
     "DATETIME(4)",
     "DATETIME(5)",
     "DATETIME(6)",
-    // TODO: Fix test setup to use same timezone
-    // "TIMESTAMP",
     NULL
 };
 
@@ -112,6 +110,19 @@ static const char* datetime_values[] =
     NULL
 };
 
+static const char* timestamp_types[] =
+{
+    "TIMESTAMP",
+    NULL
+};
+
+static const char* timestamp_values[] =
+{
+    "'2018-01-01 11:11:11'",
+    "'0-00-00 00:00:00'",
+    NULL
+};
+
 static const char* date_types[] =
 {
     "DATE",
@@ -156,6 +167,7 @@ struct
     {string_types, string_values},
     {binary_types, binary_values},
     {datetime_types, datetime_values},
+    {timestamp_types, timestamp_values},
     {date_types, date_values},
     {time_types, time_values},
     {0, 0}