LQ tests too strict (off by 1 failure)

On one case lease query premium tests failed with the following error:

08:16:19  [ RUN      ] LeaseQueryImpl6ProcessTest.queryByClientIdActiveLeases
08:16:19  ../../../../../../../../premium/src/hooks/dhcp/lease_query/tests/lease_query_impl6_unittest.cc:1585: Failure
08:16:19  Expected equality of these values:
08:16:19    100
08:16:19    cltt_opt->getValue()
08:16:19      Which is: 101
08:16:19  ../../../../../../../../premium/src/hooks/dhcp/lease_query/tests/lease_query_impl6_unittest.cc:401: Failure
08:16:19  Expected equality of these values:
08:16:19    lease->valid_lft_ - elapsed
08:16:19      Which is: 3500
08:16:19    iaaddr_opt->getValid()
08:16:19      Which is: 3499
08:16:19  ../../../../../../../../premium/src/hooks/dhcp/lease_query/tests/lease_query_impl6_unittest.cc:402: Failure
08:16:19  Expected equality of these values:
08:16:19    lease->preferred_lft_ - elapsed
08:16:19      Which is: 3500
08:16:19    iaaddr_opt->getPreferred()
08:16:19      Which is: 3499
08:16:19  ../../../../../../../../premium/src/hooks/dhcp/lease_query/tests/lease_query_impl6_unittest.cc:417: Failure
08:16:19  Expected equality of these values:
08:16:19    lease->valid_lft_ - elapsed
08:16:19      Which is: 3400
08:16:19    iaprefix_opt->getValid()
08:16:19      Which is: 3399
08:16:19  ../../../../../../../../premium/src/hooks/dhcp/lease_query/tests/lease_query_impl6_unittest.cc:418: Failure
08:16:19  Expected equality of these values:
08:16:19    lease->preferred_lft_ - elapsed
08:16:19      Which is: 3400
08:16:19    iaprefix_opt->getPreferred()
08:16:19      Which is: 3399
08:16:19  [  FAILED  ] LeaseQueryImpl6ProcessTest.queryByClientIdActiveLeases (1 ms)

Details: jenkins

This looks like a timing error that, depending on when exactly the code get run, the values may be off by 1.