src/bin/dhcp6/tests/dhcp6_srv_unittest.cc
    added tests:
    TEST_F(Dhcpv6SrvTest, hostReservationWithHostName)
    TEST_F(Dhcpv6SrvTest, hostReservationWithoutHostName)

src/bin/dhcp6/tests/dhcp6_test_utils.h
src/bin/dhcp6/tests/dhcp6_test_utils.cc
    Dhcpv6SrvTest::createHost6() - this method was moved
    here from FqdnDhcpv6SrvTest()

src/bin/dhcp6/tests/fqdn_unittest.cc
    added tests:
    TEST_F(FqdnDhcpv6SrvTest, hostnameReservationSuffix)
    TEST_F(FqdnDhcpv6SrvTest, hostnameReservationNoSuffix)
    TEST_F(FqdnDhcpv6SrvTest, hostnameReservationDdnsDisabled)