Ability to manually change a number of users portal or quota through manual override

[astrochun]

This issue has split off from #43.

Primary work will be in user_update script. At the moment, this script can only handle a single patron.
Minimum: a comma-separated list of netid
Desired: Minimum + ability to use simple txt file with netid's (one per row).

• Update user_update:
  - [x] Split out netid by commas. Best to have as a set to avoid any duplicate entries
  - [x] Handling of incorrect ID (via user_uaid)
• Update `ldap_query.uid_query() to provide appropriate search criteria. This will be tough because of handling the users that have access and the users that do not have access (though set operations should avoid conflicts). Larger issue is handling incorrect netid's.
• Calls to get_current_groups needs to handle multi-user. Best to use dict within dict
• For full compatibility, the quota case needs a root option which implies no association with a quota
• Improvements needed in ManualOverride to handle multi-user add to tables, etc.

[astrochun]

This has been escalated higher. It might be best to have this as a feature as I don't think it's an easy fix. Will push to develop to use temporarily until v0.12.0 is complete.