Add SMF support for various Heimdal services

My read of the pkgsrc support means that we have a single manifest.xml, regardless of the number of services, so I have all of the following services in a single service bundle:

kdc -- kerberos key distribution center
kadmin -- kerberos admin service
kpasswdd -- kerberos password change daemon
ipropd  -- two instances (master and slave) for the Heimdal Incremental Propagation Daemon