Refactor: python: Improve maintenancemode.py.

• Disable pylint warnings we can't really do anything about.

• Simplify how the pats lists are built.

• Get rid of interval. This is only used in one place in the bottom of the file.

• Get rid of the max attribute. It is unused.

• Rename the rid attribute to _rid. It is used all over the place, but only ever within this class. Likewise, rename action to _action.

• Rename all methods to be private and follow python naming conventions. Rename various parameters and variables to do the same.

• _toggle_maintenance_mode should take a boolean for what to do instead of a string.

• Get rid of unnecessary elif statements.

• Use += where possible.

• Fix comparisons to use "not" where possible.