Update debian base to 8.5

Author: marek-obuchowicz

debian-8-jessie-virtualbox.json

@@ -5,9 +5,9 @@
     "disk_size": "50000",
     "ssh_port": "22",
     "ssh_wait_timeout": "10000s",
-    "iso_url": "http://cdimage.debian.org/cdimage/release/8.3.0/amd64/iso-cd/debian-8.3.0-amd64-netinst.iso",
-    "iso_md5": "a9b490b4215d1e72e876b031dafa7184",
-    "vm_name": "debian83"
+    "iso_url": "http://cdimage.debian.org/cdimage/release/8.5.0/amd64/iso-cd/debian-8.5.0-amd64-netinst.iso",
+    "iso_md5": "3e1b9029a0cf188730646c379d15073f",
+    "vm_name": "debian85"
   },
   "builders": [
     {