Sanity Checks for 1.7.10 rc1

Please verify the packages and files according to
https://wiki.isc.org/bin/view/QA/KeaReleaseProcess, "4. Sanity Checks" chapter
and your imagination.

!!!!!!!
Before starting any checks. please, state in Sanity Checks issue in GitLab
https://gitlab.isc.org/isc-projects/kea/-/issues/1350
what check you are doing in a thread/discussion (not as comment).
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/1.7.10-rc1
   /data/shared/sweng/kea/releases/premium-1.7.10-rc1
   /data/shared/sweng/kea/releases/subscription-1.7.10-rc1

SHA256 (1.7.10-rc1/kea-1.7.10.tar.gz) = 4e121f0e58b175a827581c69cb1d60778647049fa47f142940dddc9ce58f3c82
SHA256 (subscription-1.7.10-rc1/kea-subscription-1.7.10.tar.gz) = 70db4dd2d8ec6205bc68fe102c2823c3516c19b577c071b0922980d2518b4df5
SHA256 (premium-1.7.10-rc1/kea-premium-1.7.10.tar.gz) = c352f291c6e9346ba691f079353b8c9c3b8426b9dcddda35b2d1c6b4d8ec600b

2) [rpm/deb packages] on packages.isc.org, exact packages versions are stored here:
   https://jenkins.isc.org/job/kea-1.7/job/pkg/337/
   Release version is 1.7.10-isc0030920200728082656 (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.