* fixes error where eos would close the cli shell
* fixes network_cli connection plugin to check before calling open_shell()
* fixes json commands being sent over eapi
* refactors supports_sessions to a property
* exposes supports_sessions as a toplevel function
* adds open_shell() to network_cli
* implements open_shell() in eos action plugin
* fixes issue with load_provider() not checking for an existing key
* adds updates to eos_config results key
* lots of minor syntax fixes in eos shared module
* adds eos_argument_spec to eos_eapi
fixes#21402
* updates eos modules to use persistent connection socket
* removes split eos shared module and combines into one
* adds singular eos doc frag (eos_local to be removed after module updates)
* updates unit test cases
