Add ipa-passwd tool
Add simple field validation package
This patch adds a package requirement, python-krbV. This is needed to
determine the current user based on their kerberos ticket.
Create separate object for Users and Groups (using same base class)
Check for uniqueness before adding new users and groups
Remove user_container from everything but add operations
Abstract out a number of functions that are common across users and groups
Make sure all strings passed in to be in a filter are checked
Add new error message: No modifications specified
