Fixed PostgreSQL SessionImpl, use mysql_reset_connection() if it is

available

Use mysql_reset_connection() only if MySQL version is >= 5.7 or MariaDB
version is >= 3.0.0 otherwise fall back to myslq_refresh()

Data/PostgreSQL/include/Poco/Data/PostgreSQL/SessionImpl.h

@@ -62,6 +62,9 @@ public:
 	void close();
 		/// Closes the connection.
 
+	void reset();
+		/// Do nothing
+
 	bool isConnected() const;
 		/// Returns true if connected, false otherwise.
 

Data/PostgreSQL/src/SessionImpl.cpp

@@ -151,6 +151,12 @@ void SessionImpl::close()
 }
 
 
+void SessionImpl::reset()
+{
+
+}
+
+
 bool SessionImpl::isConnected() const
 {
 	return _sessionHandle.isConnected();