Allow salt-key -a/-r to work on rejected/accepted keys

This commit modifies salt-key so that -a looks at rejected keys in
addition to pending keys, and -r looks at accepted keys in addition to
pending keys.

The -A and -R arguments still operate on pending keys only.

In addition, this commit improves reporting on the CLI when keys are
rejected and deleted.
Add --include-all arg to salt-key

This commit adds an --include-all option to salt-key, and requires it to
be used in order to match rejected keys with salt-key -a, and accepted
keys with salt-key -r. See
https://github.com/saltstack/salt/pull/7509#issuecomment-25325666 for
more information.
Merge pull request #7509 from terminalmage/issue7399

Allow salt-key -a/-r to work on rejected/accepted keys