innotop is not working: missing dependency on libterm-readkey-perl

In the same vein as https://bugs.launchpad.net/ubuntu/+source/mysql-5.5/+bug/1000605
and extending MDEV-5625. Specifically see https://bugs.launchpad.net/ubuntu/+source/mysql-5.5/+bug/1000605/comments/6 for reasoning.

innotop will not work on Ubuntu 16.04 without libterm-readkey-perl. It should be a dependency of the mariadb-client-10.1 rather than a suggestion. If libterm-readkey-perl can not or should not be a dependency of mariadb-client-10.1 then innotop should be broken out into a new package with the dependency on libterm-readkey-perl correctly defined.

Thanks!