Sanity Checks for 1.7.0 rc1

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

!!!!!!!
Before starting any checks. please, state in Sanity Checks issue in GitLab
https://gitlab.isc.org/isc-projects/kea/issues/922
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/1.7.0-rc1
   /data/shared/sweng/kea/releases/premium-1.7.0-rc1
   /data/shared/sweng/kea/releases/subscription-1.7.0-rc1

SHA256 (1.7.0-rc1/kea-1.7.0.tar.gz) = 52f19c8419fd73d3cb618b951d2269951d539c12974aa7e37ad23f139e25a18b
SHA256 (subscription-1.7.0-rc1/kea-subscription-1.7.0.tar.gz) = 92d53a93e18881d9be2dbc96c29293ee45923d76ca9097abf132af21dbfb838e
SHA256 (premium-1.7.0-rc1/kea-premium-1.7.0.tar.gz) = 6c55f4a9ed74c4d1b4e7da9754919f33eec6801c90f12823d87fa46a8b62e5bf
SHA256 (1.7.0-rc1/doc/html) = d3ccd5a1ec872b946f147231d658466646f027fb2da9dd65f1f4671be4a9834b
SHA256 (1.7.0-rc1/doc/kea-arm.pdf) = 5ed731d9abbc787f9e0c51ab6f295703946c5a0ea21d09d56013fe138bbd5667
SHA256 (1.7.0-rc1/doc/kea-messages.pdf) = 47d92bf2ce7e6b0024d1003fa6d94ccfea1e2deeb030d25005f55c79483b27b9

2) [rpm/deb packages] on packages.isc.org, exact packages versions are stored here:
   https://jenkins.isc.org/job/kea-1.7/job/pkg/19/
   release version is 1.7.0-isc0001420190923140617 (please verify if it is this version while installing)