[master] Merge branch 'trac3274' DHCP client classification
Conflicts: ChangeLog src/bin/dhcp4/dhcp4_srv.cc src/bin/dhcp4/tests/dhcp4_srv_unittest.cc src/bin/dhcp4/tests/dhcp4_test_utils.h src/lib/dhcpsrv/cfgmgr.cc src/lib/dhcpsrv/cfgmgr.h
Conflicts: ChangeLog src/bin/dhcp4/dhcp4_srv.cc src/bin/dhcp4/tests/dhcp4_srv_unittest.cc src/bin/dhcp4/tests/dhcp4_test_utils.h src/lib/dhcpsrv/cfgmgr.cc src/lib/dhcpsrv/cfgmgr.h