Allow SSL for AMQP connection

[aaguilartablada]

In order to connect to an AMQPS endpoint a new attribute is necessary to configure 'SslOption' for 'ConnectionFactory'.
Furthermore, to allow using self-signed certificates for development environments another attribute has been introduced: 'InsecureSsl'.
By default, SslOption does NOT enable SNI extension (https://en.wikipedia.org/wiki/Server_Name_Indication). To enable it, setting the property 'ServerName' is enough. This extension is mandatory to allow connecting to several RabbitMQ clusters behind a load balancer.

[ghost]

All CLA requirements met.

[aaguilartablada]

@yojagad @JatinSanghvi Hello! Could you take a look at this PR, please? Thank you so much.

[JatinSanghvi]

This will also require updating RabbitMQOutput.java, RabbitMQTrigger.java and respective test cases.

[aaguilartablada]

Changes requested done and Java files updated. Thanks for your review @JatinSanghvi

[JatinSanghvi]

Thanks @aaguilartablada, I have approved the pull request. If possible, I would like to know how frequently you need to supply individual tokens (hostname, username, password, port, ssl) instead of just the connection string. Most of other extensions are allowing just connection string to be passed.

[aaguilartablada]

Thaks so much @JatinSanghvi. I use connection string, but I applied the changes in this PR also for individual tokens in case someone using them need to configure SSL this way.

When do you plan to release a new version including these changes? Thanks.

[JatinSanghvi]

I am planning to get 2.0.0-preview1 released this week if everything goes well. The release will unblock users who are encountering issue #173. This would be a pre-release as there are more breaking changes planned for future releases. I am thinking of only retaining connection string since the attribute properties and internal method signatures are getting complex with introduction of new connection-string elements (next one in sequence was going to be a vhost property).

[aaguilartablada]

Perfect! Thanks again. Good luck ;)