issues: adding newlines on Printf's

To see 
```
vbatts@jellyroll ~/src/docker/docker (master) $ issues search --labels /dist/registry
Please enter a search term
vbatts@jellyroll ~/src/docker/docker (master) $
```

instead of:
```
vbatts@jellyroll ~/src/docker/docker (master) $ issues search --labels /dist/registry
Please enter a search termvbatts@jellyroll ~/src/docker/docker (master) $
```

Docker-DCO-1.1-Signed-off-by: Vincent Batts <vbatts@redhat.com> (github: vbatts)