ask_passphrase parameter now gem version guarded
ask_passphrase parameter now gem version guarded

MSP-9902

* Have to check against the version that added this parameter as arity
is of no help in this case. We should at some point patch MSF's net-ssh
and get rid of this.

rapid7/metasploit-credential,rapid7/metasploit-credential,rapid7/metasploit-credential