URLs which contain password is leaked in debug logs.

[mashhurs]

Issue description

There are mainly two issues with the plugin:

• When Logstash registers the plugin with its configs, configs which contain passwords (in this case urls) are seen in the debug logs.
• when preparing requests, we are logging in the logic which password is leaked. Details: URL with password are show in the log and STDOUT #81

Expectation

URLs should be in a way of securing the sensitive data so that it shouldn't allow sensitive data to print.