Added gethostbyname() to BaseAffix.
Added gethostbyname() to BaseAffix.

It used to be overridden in affix_wrapper_lib.r2py (which implemented
the old RepyNetworkApiWrapper). In the near future, we will have a
NamingAndResolverAffix component that will do lookups (and announcements,
and return an ID rather than the node's IP address, etc.).

BuildSeash/affix,BuildSeash/affix-repo,SeattleTestbed/affix