src/lib/util/strutil.cc
    StringSanitizerImpl::scrub() - modified non-USE_REGEX code to
    handle embedded nuls.

src/lib/util/tests/strutil_unittest.cc
    Updated tests

src/bin/dhcp4/tests/fqdn_unittest.cc
src/bin/dhcp4/tests/get_config_unittest.cc
src/bin/dhcp6/tests/fqdn_unittest.cc
src/bin/dhcp6/tests/get_config_unittest.cc
    updated testing

src/lib/dhcpsrv/parsers/simple_parser4.cc
src/lib/dhcpsrv/parsers/simple_parser6.cc
    Added global default values

doc/sphinx/arm/dhcp6-srv.rst
doc/sphinx/arm/dhcp4-srv.rst
    Updated sanitizing text