* clean up functions and remove unneeded code
* config difference now includes keyword argument
* module reports changed when save argument is yes with or without check_mode
* updated fail_json return with exc kwargs
* fixed up import statements
* fixes issues with import error
* removes need for filter attribute in Cli instance
* now filters config either from device or provided via config argument
ref: #2890
This bug was introduced accidentally when refactoring to 2.2. The instance
of the candidate config was deleted. This adds the candidate config
instance back
fixes#2890
* commands argument now accepts a dict arguments
* only show commands are allowd when check mode is specified
* config mode is no longer allowed in the command stack
* add argument match with valid values any, all
* removes get_module() factory method for NetworkModule
* add src argument to provide path to config file
* add new choice to match used to ignore current running config
* add update argument with choices merge or check
* add backup argument to backup current running config to control host
* add defaults argument to control collection of config with or withoutdefaults
* add save argument to save current running config to startup config
