Use a more compatible Foundry/Brocade syntax for turning off paging

Unfortunately, older Foundry/Brocade hardware doesn't support "terminal
length 0" and you have to use the much clunkier "skip-page-display"
instead. This especially affects older FastIron era devices.
Merge pull request #31 from dotwaffle/foundry-old

Use a more compatible Foundry/Brocade syntax for turning off paging
Support creating session log of telnet/ssh

If you have
input:
  debug: session_log

Then session_log-telnet and session_log-ssh will be created showing what
the telnet/ssh saw. Helpful in model development.
Merge branch 'master' into cfg_as_object