New Protocol: AMQP 0.9.1

[developStorm]

This PR adds support for scanning AMQP(S) 0.9.1 hosts.

The protocol supports following special flags:

zgrab2/modules/amqp/scanner.go

Lines 13 to 23 in e4ea1b2

	type Flags struct {
	zgrab2.BaseFlags
	Vhost string `long:"vhost" description:"The vhost to connect to" default:"/"`
	AuthUser string `long:"auth-user" description:"Username to use for authentication. Must be used with --auth-pass. No auth is attempted if not provided."`
	AuthPass string `long:"auth-pass" description:"Password to use for authentication. Must be used with --auth-user. No auth is attempted if not provided."`
	UseTLS bool `long:"use-tls" description:"Use TLS to connect to the server. Note that AMQPS uses a different default port (5671) than AMQP (5672) and you will need to specify that port manually with -p."`
	zgrab2.TLSFlags
	}

Tested locally against a RabbitMQ server, with and without valid credentials:

resolves #214.

[phillip-stephens]

LGTM