[SRU] Instance Connect release

[Mathieu Trudel-Lapierre]

[Impact]
New service on Amazon AWS cloud, providing SSH access to instances; available to any AWS users.

[Test Cases]
This is manually tested by Amazon:

0) Deploy an Amazon AWS instance with Instance Connect feature enabled
1) Install the ec2-instance-connect package
2) Verify that the sshd process has been restarted with the changed command-line, now including "AuthorizedKeysCommand*" options.
3) Attempt to connect to the instance using a SSH key that is known by the Instance Connect service.

[Regression Potential]
Limited to SSH access on instances where the package gets installed. This is a brand new package for a new service provided to AWS customers. In the case of an issue, things to watch out for would be for some keys to not be usable to connect to the instance when they are expected to be, as the list of authorized keys is collated by the service to include both the usual authorized_keys contents, as well as keys provided by the Instance Connect service.