MT#17685 Switch GRML iso from mirror.inode.at to deb.sipwise.com

mirror.inode.at is currently not available while we need to build
mr3.8.5 install CD ad test it to release in time.

At the same time we are updating GRML ISO very rarely, so it is
easier for us to store GRML for private and public jobs locally.
At the same time daily job will still use daily.grml.org

Change-Id: I8ef67d8e1b6d5b1caa0caf968ead780826728081

build_iso.sh

@@ -33,7 +33,7 @@ private)
   MR="no"
   PUBLIC="no"
   SIPWISE_ISO="grml64-sipwise-release_${DATE}.iso"
-  GRML_URL="http://mirror.inode.at/data/grml/"
+  GRML_URL="https://deb.sipwise.com/files/grml/"
   GRML_HASH_URL="http://download.grml.org/"
   ;;
 public)
@@ -41,7 +41,7 @@ public)
   MR="no"
   PUBLIC="yes"
   SIPWISE_ISO="sip_provider_CE_installcd.iso"
-  GRML_URL="http://mirror.inode.at/data/grml/"
+  GRML_URL="https://deb.sipwise.com/files/grml/"
   GRML_HASH_URL="http://download.grml.org/"
   ;;
 *)