Fix uninitialized fd and status in Data_Stream constructors

Initialize fd=-1 and status=0 in MySQL_Data_Stream and PgSQL_Data_Stream
constructors. These fields were not initialized, causing Valgrind
errors when GPFC_Statuses2() checked mybe->server_myds->status and fd.

lib/PgSQL_Data_Stream.cpp

@@ -239,6 +239,7 @@ PgSQL_Data_Stream::PgSQL_Data_Stream() {
 	connect_tries = 0;
 	poll_fds_idx = -1;
 	//resultset_length = 0;
+	fd = -1;
 
 	revents = 0;
 

lib/mysql_data_stream.cpp

@@ -241,6 +241,8 @@ MySQL_Data_Stream::MySQL_Data_Stream() {
 	connect_tries=0;
 	poll_fds_idx=-1;
 	resultset_length=0;
+	status=0;
+	fd=-1;
 
 	revents = 0;