Sanity checks for Kea 2.1.6 rc1

We are now at step SANITY CHECKS of Kea 2.1.6 rc1.

Please verify the packages and files according to "4. Sanity Checks" chapter on:
    https://wiki.isc.org/bin/view/QA/KeaReleaseProcess#4.%20Sanity%20Checks
and your imagination.
Before starting any checks, please state what check you are doing in a
thread/discussion (not as comment) in Sanity Checks issue in GitLab:
    None
When you finish given check state in the same thread/discussion what is the result.
This way we know what is covered upfront and we can avoid repeating ourselves.

Release content is located on:
1) [tarballs] repo.isc.org in the following folders:
   /data/shared/sweng/kea/releases/2.1.6-rc1
   /data/shared/sweng/kea/releases/premium-2.1.6-rc1
   /data/shared/sweng/kea/releases/subscription-2.1.6-rc1

SHA256 (kea-2.1.6.tar.gz) = 7d206e9e71ccf7ea4632eac7c19268fb8afcbec2f5d3da66354a5150b315c80a
SHA256 (kea-premium-2.1.6.tar.gz) = 4b8835bef2905416c970d7aa80783e97ebeb1ee0a411c3959ef6e637a397ad33
SHA256 (kea-subscription-2.1.6.tar.gz) = 86119af13b9288abd8c13d373c578bc7c82e79f54351bb08673c85da23246b47

2) APK, deb, RPM packages on packages.aws.isc.org, exact packages versions are stored here:
    https://jenkins.aws.isc.org/job/kea-dev/job/pkg/796/
    Release versions are:
    APK: 2.1.6-r20220524082245: https://packages.aws.isc.org/#browse/search/raw=format%3Draw%20AND%20name.raw%3D*r20220524082245.apk
    deb: 2.1.6-isc20220524082245: https://packages.aws.isc.org/#browse/search/apt=format%3Dapt%20AND%20version%3D2.1.6-isc20220524082245
    RPM: 2.1.6-isc20220524082245.[os]: https://packages.aws.isc.org/#browse/search/yum=format%3Dyum%20AND%20version%3D2.1.6-isc20220524082245*
    Installation instructions are here: https://wiki.isc.org/bin/view/QA/KeaReleaseProcess#4.%20Sanity%20Checks, chapter 4. Sanity Checks, point 9.