Description

A few sentences describing the overall goals of the pull request's commits.

DNS, NTP, and Remote support contact modules are added to get the details and modify the attributes.
Remote support module is added to get the details, modify the attributes, verify the configuration and send a test alert.
Added CRUD operations and operation to send a test email for the email module.
The SMTP config module is added to get the details, modify the attributes and send a test email.
The Info module is enhanced to list DNS servers, email notification destinations, NTP servers, remote support configuration, remote support contacts, and SMTP configuration.

Checklist:

[x] I have performed a self-review of my own code to ensure there are no formatting, pep8, linting, or security issues
[x] I have performed Ansible Sanity test using --docker default
[x] I have verified that new and existing unit tests pass locally with my changes
[x] I have not allowed coverage numbers to degenerate
[ ] I have maintained at least 90% code coverage
[x] I have commented my code, particularly in hard-to-understand areas
[x] I have made corresponding changes to the documentation
[x] I have added tests that prove my fix is effective or that my feature works
[x] Backward compatibility is not broken

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration