Add jppc:open-session under jppc-util to replace jcs:open

Hi

I create a new function under jppc-util to replace jcs:open, with this new function, if the first tentative to open a session doesn't work, jsnap try with the netconf protocol instead of junosscript

it doesn't change the default behavior for device that support junoscript and it nicely add support for all netconf devices

Also, I faced issue with EOL encoding on these file, So I reconvert them into Unix format, that is why all lines report updates

Damien