re6stnet: do not let the registry listen to ipv6

The only purpose of Apache is to protect the registry process
from public internet, because we don't trust Python2 HTTP layer.

software/re6stnet/buildout.hash.cfg

@@ -18,7 +18,7 @@ md5sum = 01938aa1683b7994f814fff6d964b9ba
 
 [template-re6stnet]
 filename = instance-re6stnet.cfg.in
-md5sum = bc3a7aebbd15b90309e6bdaffaf9643e
+md5sum = 1dee1b15c4ec19e523038c806d83ee12
 
 [template-apache-conf]
 filename = apache.conf.in
@@ -26,4 +26,4 @@ md5sum = 3d55f7c9c4fc7279f06bfe6313a78a4b
 
 [template-re6st-registry-conf]
 filename = re6st-registry.conf.in
-md5sum = b0f0facfea82a4481f4fb5b0b263e09a
+md5sum = feb4b3318f37414d1bf3d16a03aec93d

software/re6stnet/instance-re6stnet.cfg.in

@@ -66,7 +66,6 @@ post = test ! -s ${apache-conf:pid-file} || {{ bin_directory }}/slapos-kill --pi
 [re6st-registry-conf-dict]
 port = 9201
 ipv4 = {{ ipv4 }}
-ipv6 = {{ ipv6 }}
 db = ${re6stnet-dirs:data}/registry.db
 ca = ${re6stnet-dirs:ssl}/re6stnet.crt
 key = ${re6stnet-dirs:ssl}/re6stnet.key

software/re6stnet/re6st-registry.conf.in

 port  {{ parameter_dict['port'] }}
 4  {{ parameter_dict['ipv4'] }}
 authorized-origin  {{ parameter_dict['ipv4'] }}
-# 6  {{ parameter_dict['ipv6'] }}
+6  ''
 db  {{ parameter_dict['db'] }}
 ca  {{ parameter_dict['ca'] }}
 key  {{ parameter_dict['key'] }}