Test of the "ddns-tuning" premium hook basic functionality.
This basic test sets ddns-tuning hook parameter to replace hostname with expression including text and hardware address.
DORA/SARR exchange acquires lease and leaseX-get command returns hostname applied to lease.
We then compare returned lease with expected.
Tests are run for one subnet with global settings and multiple subnets with per-subnet settings.
Checks are also made for proper behaviour with global suffix applied or global tuning disabled.
Works on Kea and Kea Premium branch:
Tests for isc-private/qa-dhcp#302