r10368: when building the epm tower, don't put host names in the ip address

r10368: when building the epm tower, don't put host names in the ip address
field, instead put a zero address. Note that zero is correct (ie. we
shouldn't do the lookup) as in the client we want to send a zero for
the server to fill in. When we make this call from the server we fill
in a real IP.
(This used to be commit e54c8b5658761c33d50a1a557d2ec77229b07b47)