fixes handling of the shorter '-i' flag when getting nodes by hw_id

Without this change, the '-i' flag is not handled properly under a 'hanlon node' command.  For example, this command would work: 
```
hanlon node --hw_id 564DC8E3-22AC-0D46-6001-50B003AECE0B -f attrib
```
but this would not
```
hanlon node -i 564DC8E3-22AC-0D46-6001-50B003AECE0B -f attrib
```
the second command should now work as expected...