Merge release branch 4.8 to master

* 4.8:
  This patch addresses two issues:

Author: swill

systemvm/patches/debian/config/opt/cloud/bin/cs/CsConfig.py

@@ -68,8 +68,11 @@ def get_domain(self):
 
     def get_dns(self):
         dns = []
-        # Check what happens with use_ext_dns
-        dns.append(self.address().get_guest_ip())
+        if not self.cl.get_use_ext_dns():
+            if not self.is_vpc() and self.cl.is_redundant():
+                dns.append(self.cl.get_guest_gw())
+            else:
+                dns.append(self.address().get_guest_ip())
         names = ["dns1", "dns2"]
         for name in names:
             if name in self.cmdline().idata():

systemvm/patches/debian/config/opt/cloud/bin/cs/CsDatabag.py

@@ -148,3 +148,9 @@ def get_gateway(self):
         if "gateway" in self.idata():
             return self.idata()['gateway']
         return False
+
+    def get_use_ext_dns(self):
+        if "useextdns" in self.idata():
+            return self.idata()['useextdns']
+        return False
+