Spigot related functions

The Arbiter role has privileged access rights to the following functions

addSpigot()

The Arbiter can add a second or further Revenue Contracts to a Line of Credit that has already been deployed.

updateWhitelist()

The Arbiter can allow the Borrower to call certain functions on their protocol contracts for maintenance.

releaseSpigot()

Transfers ownership of the entire Spigot from the Line of Credit to the Arbiter if the Line of Credit is liquidatable.