NSO operations can take much longer than 10 seconds as they operate on
real network equipment, set default timeout to 5 minutes and allow for
user override.
* update version parsing and move requirements to nso_* modules
prepare for introduction of nso_show module that has other version
requirements than the existing nso_* modules.
* Add nso_show module for retreiving config from Cisco NSO
New module that supports getting configuration and operational data
from Cisco NSO.