* The previous module only worked for 32-bit IOSXR, and already
there some fiddling with the STDIN of the process was required
when being run from netdisco-backend
* In 64-bit IOSXR, the STDIN workaround stopped working and
created a stuck ssh process on every arpnip
* This new version uses Expect instead of plain SSH, so a proper
pty is provided under any circumstances
* Successfully tested on recent 32- and 64-bit variants
