[MERGE] Add a get_login method to UIFactory and test get_password

[John Arbash Meinel]

John Arbash Meinel has voted +1.
Status is now: Semi-approved
Comment:
I happy enough with this.

I do thing we want to end up with a

get_password(user='x', host='y') and get rid of the 'prompt=' variable.

But I'd rather get this merged than worry about that.

For details, see: 
http://bundlebuggy.aaronbentley.com/request/%3Cm2hctfzgth.fsf%40bigmamac.local%3E