obmc-phosphor-discovery-service: Include hostname in service names

Currently, we'll export avahi services solely under their service names.
With multiple BMCs on a network, this ends up with multiple
indistinguisable services exposed over avahi:

  [jk@pecola ~]$ avahi-browse _obmc_console._tcp
  +    br0 IPv6 obmc_console             _obmc_console._tcp   local
  +    br0 IPv4 obmc_console             _obmc_console._tcp   local
  +    br0 IPv4 obmc_console #2          _obmc_console._tcp   local
  +    br0 IPv6 obmc_console #2          _obmc_console._tcp   local

This change uses the hostname as the identifier instead. There's no need
to include the service name, as that's what the service type field is
for.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Change-Id: I23fcbf23b7f2b41a82f9be32c09117438f44e986
diff --git a/classes/obmc-phosphor-discovery-service.bbclass b/classes/obmc-phosphor-discovery-service.bbclass
index e912bea..fdade60 100644
--- a/classes/obmc-phosphor-discovery-service.bbclass
+++ b/classes/obmc-phosphor-discovery-service.bbclass
@@ -72,7 +72,8 @@
             fd.write('<?xml version="1.0" ?>\n')
             fd.write('<!DOCTYPE service-group SYSTEM "avahi-service.dtd">\n')
             fd.write('<service-group>\n')
-            fd.write('        <name>%s</name>\n' % service_name)
+            fd.write('        <name replace-wildcards="yes">%s on %%h</name>\n'
+			    % service_name)
             fd.write('        <service>\n')
             fd.write('                <type>%s</type>\n' % service_type)
             fd.write('                <port>%s</port>\n' % service_port)