authenticate (Net::SSH::Authentication::Methods::Hostbased)

        # File lib/net/ssh/authentication/methods/hostbased.rb, line 14
    14:           def authenticate(next_service, username, password=nil)
    15:             return false unless key_manager
    16:
    17:             key_manager.each_identity do |identity|
    18:               return true if authenticate_with(identity, next_service,
    19:                 username, key_manager)
    20:             end
    21:
    22:             return false
    23:           end