apache-frontend: Drop _ from domain name

_ (underscore) is not supported by apache as domain name
(https://bugzilla.redhat.com/show_bug.cgi?id=1410130), so avoid using it.

/reviewed-on nexedi/slapos!320

software/apache-frontend/buildout.hash.cfg

@@ -27,7 +27,7 @@ md5sum = c55506cfb92d87f915d50d32fb129a28
 
 [template-slave-list]
 filename = templates/apache-custom-slave-list.cfg.in
-md5sum = 4010f7366262d00c33f9e7f53f63d42e
+md5sum = 24e514ad6f15859229db46f24a8cd280
 
 [template-slave-configuration]
 filename = templates/custom-virtualhost.conf.in
@@ -43,7 +43,7 @@ md5sum = a56045e7b53ff00ab34d2a8f911fc1a1
 
 [template-custom-slave-list]
 filename = templates/apache-custom-slave-list.cfg.in
-md5sum = 4010f7366262d00c33f9e7f53f63d42e
+md5sum = 24e514ad6f15859229db46f24a8cd280
 
 [template-not-found-html]
 filename = templates/notfound.html

software/apache-frontend/templates/apache-custom-slave-list.cfg.in

@@ -81,7 +81,7 @@ crl = {{ custom_ssl_directory }}/crl/
 
 {# Set slave domain if none was defined #}
 {%   if slave_instance.get('custom_domain', None) == None -%}
-{%     set domain_prefix = slave_instance.get('slave_reference').replace("-", "").lower() -%}
+{%     set domain_prefix = slave_instance.get('slave_reference').replace("-", "").replace("_", "").lower() -%}
 {%     if slave_type in NGINX_TYPE_LIST -%}
 {%       do slave_instance.__setitem__('custom_domain', "%s.%s" % (domain_prefix, slapparameter_dict.get('nginx-domain', slapparameter_dict.get('domain')))) -%}
 {%     else -%}