pkg/kamailio: for dispatcher work required working DNS resolution daemon

(cherry picked from commit aa7b2460ff0d8085ddc8ae9232a9fea0fe0db5f8)

pkg/kamailio/obs/kamailio.service

@@ -1,8 +1,8 @@
 [Unit]
 Description=Kamailio - the Open Source SIP Server
 Documentation=man:kamailio(8)
-Wants=network-online.target
-After=network-online.target
+Wants=network-online.target nss-lookup.target
+After=network-online.target nss-lookup.target
 
 [Service]
 Type=simple