* 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.
* Refactor common network shared and platform specific code into package (part-1)
As per proposal #76 refactor common network shared and platform specific
code into sub-package.
https://github.com/ansible/proposals/issues/76
* ansible.module_utils.network.common - command shared functions
* ansible.module_utils.network.{{ platform }} - where platform is platform specific shared functions
* Fix review comments
* Fix review comments
