[master] Merge branch 'trac4297' (hook libs can now take parameters)

diff --cc src/lib/dhcpsrv/parsers/dhcp_parsers.cc
Simple merge

diff --cc src/lib/dhcpsrv/tests/Makefile.am
Simple merge

diff --cc src/lib/dhcpsrv/tests/alloc_engine_expiration_unittest.cc
Simple merge

diff --cc src/lib/dhcpsrv/tests/dhcp_parsers_unittest.cc
Simple merge