Since this module contains more than the logbook
class and really is a our generic models that are used
to hold the runtime structure it is more appropriate to
place it under a models module and deprecate the usage
of the old module by placing a warning there (so that
when it is imported that warning is triggered).
Change-Id: I79def5ee08f560d38f2c9dcefd0b33becc2a4d36
1e3dc09453