Remove apparent debugging lines

When accepting a key, extraneous lines appear in the terminal:

```
root@saltmine:~erik/saltdev#  salt-key -A
{'minions_pre': ['saltmine']}
minions_pre
{'minions_pre': ['saltmine']}
The following keys are going to be accepted:
Unaccepted Keys:
saltmine
Proceed? [n/Y]
```

This appears to have been introduced in 7b03382, and only appears in develop.