Audit mode proposal

There is a mix of subjects here - sometimes, the client is running the phases, and sometimes the phases are just being ran.  There is some literature term for this possessive vs non-possessive thing-a-ma-jig but I don't know what its called.

```
If neither form of the flag is passed, chef client will run both phases.  If passed `--no-audit-mode` chef client will skip audits after converging the resources.  If passed `--audit-mode` chef client will skip converging resources but still perform the audits.
```

Written this way, it is the chef client acting on the subject the whole time.