The auxiliary report mixin overrides some of the methods in
Metasploit::Credential, which is fine in framework, but causes issues in
projects relying on the base behavior of Metasploit::Credential. This
changes the include scope from global to just whatever includes the
external module mixin.
Changes from a "hope we get at most one message at a time" model to
something beginning to resemble a state machine. Also logs error output
and fails the MSF module when the external module fails.
Adam Cammack