Swift client import error

Modify swift client import to work with newer versions (>= 1.7.4). 

Correct this error :
swauth-cleanup-tokens -A https://swift.example.org/auth/ -K swauthkey --purge=account1 
Traceback (most recent call last):
  File "/usr/bin/swauth-cleanup-tokens", line 28, in <module>
    from swift.common.client import Connection, ClientException
ImportError: No module named client
Merge pull request #53 from jgrmnprz/patch-1

Swift client import error