Jinja function get section of running config

[indy-independence]

Before pushing config, get running config and parse sections, add jinja function to insert one of those section in a template

To be used for firewalls where firewall rules are managed outside of cnaas-nms

Double check config hash check works as expected

Get config sections via: https://netutils.readthedocs.io/en/latest/user/lib_use_cases/ config parsing

[indy-independence]

PR #369 should fix this