update_interface: Use the dsdb update_host command when updating a mac.
update_interface: Use the dsdb update_host command when updating a mac.

Addresses-Issue: Jira/AQUILONAQD-263
Unfortunately the DSDB command only allows the mac address to be updated.
Updating the IP address still requires removing the old entry from DSDB
and adding a new one.  Hopefully this will all change when the DNS
restructuring is rolled out.

stdweird/aquilon,quattor/aquilon,guillaume-philippon/aquilon,guillaume-philippon/aquilon,stdweird/aquilon,stdweird/aquilon,guillaume-philippon/aquilon,quattor/aquilon,quattor/aquilon