Add support for obsoleting ACL requests
Add the first work on a pkgdb-admin script

Currently supports:
`pkgdb-admin list` allowing one to list the admin actions, with a specific
status or all of them. It also supports restricting the admin actions to a
certain package or a certain packager.

`pkgdb-admin update` allowing to change the status of a pending admin action.
Fix formatting for the logs
Add the `process` action to `pkgdb-admin` to actually process an admin action
Handles `request.unretire` in pkgdb-admin list
Handle situation where a new action is added to pkgdb but unknown to pkgdb-admin
Update the README file to reflect the new structure of the project
Re-order the imports
Drop the bugzilla integration in the admin controller
Create the pkgdb2client.utils module
Move the bugzilla query from the CLI module to the utils module
Instantiate the bugzilla client only once for the whole module
Drop the call for FAS since we do not use it anywhere
Add method to login against bugzilla
Add utility method to retrieve a specified bug off bugzilla
Add utility method to find out all the users that commented on a given bug
Add a utility method to check if a specified email belongs to a packager
Start working on the check pre-package creation
Check if the summary of the bug fits the expectation for package reviews
Be consistent on how we build our strings, use .format() everywhere