class Mdm::TaskCred
@deprecated {Mdm::Task} has and belongs to many `Metasploit::Credential::Cores` in `Mdm::Task#credential_cores` and
has and belongs to many `Metasploit::Credential::Logins` in `Mdm::Task#credential_logins` when the `Metasploit::Credential::Engine` is installed.
Join model between {Mdm::Cred} and {Mdm::Task} that signifies that the {#task} found the {#cred}.