Sanity checks for Kea 1.9.10 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:
    
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/1.9.10-rc1
   /data/shared/sweng/kea/releases/premium-1.9.10-rc1
   /data/shared/sweng/kea/releases/subscription-1.9.10-rc1

SHA256 (kea-1.9.10.tar.gz) = cee15bb816c708b527f26254123437e3335a6920c7790db342bfe8d2443a2583
SHA256 (kea-premium-1.9.10.tar.gz) = c6bf1bd49c40b8d1d75267ca4a14a881425e3addfa2fc952bb9adb7b614adfad
SHA256 (kea-subscription-1.9.10.tar.gz) = 1c0b110153708a333b0d5a3af40f6a3511b1b1ff06d1861c67b738dd6c5d36d8

2) [rpm/deb packages] on packages.isc.org, exact packages versions are stored here:
    https://jenkins.aws.isc.org/job/kea-dev/job/pkg/458/
    Release version is 1.9.10-r20210728141912 (please verify if it is this version while installing).
    Install instruction is here: https://wiki.isc.org/bin/view/QA/KeaReleaseProcess, chapter 4. Sanity Checks, point 9.