Revert "build: specify docker in packer file"

This reverts commit f86fed5d.

Change-Id: I47d518d344f4518404a197badcee2938c777b02d

.packer.yml

 win32:
-    type: docker
+    type: win32
     exe_commands:
         - echo "Building Daemon"
         - git clone https://gerrit-ring.savoirfairelinux.com/ring-daemon ring-daemon