packer: Update iso urls for debian 8

  We may keep some legacy distros arround for a while, but I'm not sure it can run fully.

packer/debian8-erp5-standalone.json

@@ -16,8 +16,8 @@
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
 
-            "iso_url": "http://cdimage.debian.org/debian-cd/8.3.0/amd64/iso-cd/debian-8.3.0-amd64-netinst.iso",
-            "iso_checksum": "a9b490b4215d1e72e876b031dafa7184",
+            "iso_url": "http://cdimage.debian.org/mirror/cdimage/archive/8.11.1/amd64/iso-cd/debian-8.11.1-amd64-netinst.iso",
+            "iso_checksum": "df0ce86d0b1d81e232ad08eef58754ed",
             "iso_checksum_type": "md5",
 
             "http_directory": "http",

packer/debian8-testing-version.json

@@ -16,8 +16,8 @@
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
 
-            "iso_url": "http://cdimage.debian.org/debian-cd/8.7.1/amd64/iso-cd/debian-8.7.1-amd64-netinst.iso",
-            "iso_checksum": "453312bf56fc45669fec5ebc0f025ac7",
+            "iso_url": "http://cdimage.debian.org/mirror/cdimage/archive/8.11.1/amd64/iso-cd/debian-8.11.1-amd64-netinst.iso",
+            "iso_checksum": "df0ce86d0b1d81e232ad08eef58754ed",
             "iso_checksum_type": "md5",
 
             "http_directory": "http",

packer/debian8-vm-boostrap.json

@@ -16,8 +16,8 @@
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
 
-            "iso_url": "http://cdimage.debian.org/debian-cd/8.7.1/amd64/iso-cd/debian-8.7.1-amd64-netinst.iso",
-            "iso_checksum": "453312bf56fc45669fec5ebc0f025ac7",
+            "iso_url": "http://cdimage.debian.org/mirror/cdimage/archive/8.11.1/amd64/iso-cd/debian-8.11.1-amd64-netinst.iso",
+            "iso_checksum": "df0ce86d0b1d81e232ad08eef58754ed",
             "iso_checksum_type": "md5",
 
             "http_directory": "http",

packer/debian8-webrunner-standalone.json

@@ -16,8 +16,8 @@
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
 
-            "iso_url": "http://cdimage.debian.org/debian-cd/8.3.0/amd64/iso-cd/debian-8.3.0-amd64-netinst.iso",
-            "iso_checksum": "a9b490b4215d1e72e876b031dafa7184",
+            "iso_url": "http://cdimage.debian.org/mirror/cdimage/archive/8.11.1/amd64/iso-cd/debian-8.11.1-amd64-netinst.iso",
+            "iso_checksum": "df0ce86d0b1d81e232ad08eef58754ed",
             "iso_checksum_type": "md5",
 
             "http_directory": "http",

packer/debian8-wendelin-standalone.json

@@ -16,8 +16,8 @@
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}",
 
-            "iso_url": "http://cdimage.debian.org/debian-cd/8.3.0/amd64/iso-cd/debian-8.3.0-amd64-netinst.iso",
-            "iso_checksum": "a9b490b4215d1e72e876b031dafa7184",
+            "iso_url": "http://cdimage.debian.org/mirror/cdimage/archive/8.11.1/amd64/iso-cd/debian-8.11.1-amd64-netinst.iso",
+            "iso_checksum": "df0ce86d0b1d81e232ad08eef58754ed",
             "iso_checksum_type": "md5",
 
             "http_directory": "http",

packer/debian8.json

@@ -18,8 +18,8 @@
             "accelerator": "kvm",
             "disk_size": "{{ user `disk_size`}}000",
 
-            "iso_url": "http://cdimage.debian.org/debian-cd/8.6.0/amd64/iso-cd/debian-8.6.0-amd64-netinst.iso",
-            "iso_checksum": "e9f61bf327db6d8f7cee05a99f2353cc",
+            "iso_url": "http://cdimage.debian.org/mirror/cdimage/archive/8.11.1/amd64/iso-cd/debian-8.11.1-amd64-netinst.iso",
+            "iso_checksum": "df0ce86d0b1d81e232ad08eef58754ed",
             "iso_checksum_type": "md5",
 
             "http_directory": "http",