remove db48,db63,db75,db76,db77 from dhcp

db48 - RT #7321
db63 - RT #7320
db75 - not in monitoring or config
db76 - not in monitoring or config
db77 - RT #7332

([Ops] [3668] pdns-templates/wmnet: added up to db77) from SVN

Change-Id: I08e7710459897f60cbd5dae853837414644f4312