*Read* auths linked to actions in contracts

[dallasjohnson]

After a linkauth action has been executed linking an account's permissions to a contract's actions there appears to be no way to read that link from the blockchain. The best solutions appear to be capturing the the calls to linkauth and deleteauth from the chain and maintain the database manually. The use case i would require is to be able to execute integration tests against a local instance of EOSIO to ensure that linkauth actions have succeeded so that failures of subsequent action tests against my smart contracts are only failing due to internal logic in the action rather than difficult to determine pre-conditions related to failing linkauth actions.