The fix allows the asa_config module to request the config to contain
all default statements or password information necessary for vpn
tunnel endpoints
* 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
* 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
