The generation of keys does not involve all the checks required to accept/deny/list keys. This code change allows:
* regular users to generate keys
* `/etc/salt` and `/var/log/salt` not to exist or not to be readable by the current user
It also does not check for a running master. We have now lowered the requirements to run this script just for generating keys.
Reused the output options and logging setup mix-ins.
Fixed a bug introduced in previous commit on `salt.utils.parsers.SaltCPOptionParser._mixin_after_parsed()`, function does not accept any arguments.
