Fix: DNS installer adds invalid zonemgr email

Installer adds zonemgr as relative (and invalid) address.
This fix force installer to use absolute email.

Ticket: https://fedorahosted.org/freeipa/ticket/4707
Reviewed-By: David Kupka <dkupka@redhat.com>

install/share/bind.zone.db.template

@@ -1,6 +1,6 @@
 $$ORIGIN $DOMAIN.
 $$TTL	86400
-@			IN SOA	$DOMAIN. $ZONEMGR. (
+@			IN SOA	$DOMAIN. $ZONEMGR (
 				01		; serial 
 				3H		; refresh
 				15M		; retry

ipaserver/install/bindinstance.py

@@ -563,7 +563,7 @@ class BindInstance(service.Service):
         self.no_dnssec_validation=no_dnssec_validation
 
         if not zonemgr:
-            self.zonemgr = 'hostmaster.%s' % self.domain
+            self.zonemgr = 'hostmaster.%s' % normalize_zone(self.domain)
         else:
             self.zonemgr = normalize_zonemgr(zonemgr)