[portsyncd] allow port syncd to parse port_config.ini in random colum…

…n order (sonic-net#445)

- Parse the column header to decide column ordering.
- Extra column(s) will be ignored.

Signed-off-by: Ying Xie <ying.xie@microsoft.com>

portsyncd/portsyncd.cpp

@@ -205,17 +205,15 @@ void handlePortConfigFile(ProducerStateTable &p, string file)
  {
  if (line.at(0) == '#')
  {
- /* Find out what info is specified in the configuration file */
- for (auto it = header.begin(); it != header.end();)
- {
- if (line.find(*it) == string::npos)
- {
- it = header.erase(it);
- }
- else
- {
- ++it;
- }
+ // Take this line as column header line
+ istringstream iss_hdr(line.substr(1));
+ string hdr;
+
+ header.clear();
+ while (! iss_hdr.eof()) {
+ iss_hdr >> hdr;
+ cout << "Adding column header '" << hdr << "'" << endl;
+ header.push_back(hdr);
  }
 
  continue;