Sanity checks for Kea 1.9.10 rc2

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-rc2
   /data/shared/sweng/kea/releases/premium-1.9.10-rc2
   /data/shared/sweng/kea/releases/subscription-1.9.10-rc2

SHA256 (kea-1.9.10.tar.gz) = c1ae286b1730ded1f6e086bfc3bb8c64efaf71afa1c519b9b736440a68020dd0
SHA256 (kea-premium-1.9.10.tar.gz) = d18a5271d221c5d0093352f53edf135a218d8a032a8c81070273b7604ce0bdb4
SHA256 (kea-subscription-1.9.10.tar.gz) = 75e5f3b8a712ffff85cbd0e79c3be7ebcdcf22225fc519a8c7347ad4a8b27759

2) [rpm/deb packages] on packages.isc.org, exact packages versions are stored here:
    https://jenkins.aws.isc.org/job/kea-dev/job/pkg/459/
    Release version is 1.9.10-r20210729160353 (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.