Add exos_facts module. Known limitations at this time include:
- Interface MTU is not reported.
- Only primary interface IP is reported.
Add basic unit tests for the exos_facts module.
An EXOS CLI prompt can be prefixed with '! ' (shutting down), '* '
(running configuration does not match saved configuration), and
can include various status tokens within parentheses after these
prefixes. Update prompt regex to accept valid CLI prompts.
Dag Wieers
Matt Clay
Lance Richardson