fixes #1148 - CRUD on lookup values via the API

fixes #1125 - tftp proxy might not always be initialized

refs #1128 - ensure that parameters cache is cleared between tests

fixes #1121 - convert dns handling to real network objects

fixes #1120 - Replaced DHCP functionaitlity by the new net dhcp record classes

Fixes #1095 - Vendor_class error reporting is incorrect

Signed-off-by: Paul Kelly <paul.ian.kelly@googlemail.com>

fixes #724 - Allow default VM specs to be tied to a hostgroup

fixes #762 - Check class assignment consistency

fixes #1077 - Ensure that host OS attributes are related to the OS itself

fixes #1078 - Foreman should accept minimal parameters when creating a new host