Fixed error message when unable to generate a token

When using any of the command line tools if you specify an invalid server URL, e.g. `-s http://host:6080/arcis` the error message given is:
`Error connecting to REST services http://host:6080/arcis/rest/services/: __init__() takes exactly 6 arguments (2 given)`
Now it the message is:
`Error connecting to REST services http://host:6080/arcis/rest/services/: HTTP Error 401: Could not create token using URL http://host:6080/arcis/rest/services/`