Bug 1159067 - [RFE] user cred from config

Bug 1159067 - [RFE] allow pulp to read user credentials from users admin.conf
if he/she does not want to provide password on command prompt
or --password in pulp-admin

this is basically for writing a batch job that would include multiple command lines together.
If you could drop the #rfe-1159067 from this comment, and also make sure there's a space between # and get that would fit our style a little more closely.