Closes #2348 (closed) yet again.
On some systems, unit test fail to build with:
allocation_state_unittest.cc:35:5: required from here
/usr/src/googletest/googletest/include/gtest/gtest.h:1392:11: error: no match for ‘operator==’ (operand types are ‘const boost::date_time::special_values’ and ‘const boost::posix_time::ptime’)
if (lhs == rhs) {
~~~~^~~~~~Latest job with error: https://jenkins.aws.isc.org/job/kea-dev/job/ut-extended/912/
Job on this branch: https://jenkins.aws.isc.org/view/Kea-manual/job/kea-manual/job/ut-extended/167/