Add param outputter to cache runner functions to specify salt.output

This should be seen as a *not-so-ugly* workaround until --out arrives for _all_ runners and doesn't change default behavior.

Example:

```
# salt-run cache.grains minion.domain.de
minion.domain.de:
    ----------
    SSDs:
    biosreleasedate:
        01/01/2011
    biosversion:
        Bochs
    cpu_flags:
        - fpu
        - de
        - pse
        - tsc
        - msr
        - pae
        - mce
        - cx8
[...]
```

```
# salt-run cache.grains minion.domain.de outputter=raw
{'minion.domain.de': {'biosversion': 'Bochs', 'kernel': 'Linux', ...}}
```


See also #9444.