First try with osx

Change-Id: I617d64691e51f1dd3126edc7875b22f564379163

.packer.yml

 ubuntu_14.04:
     debian: debian
     ccache: true
+    type: docker
 ubuntu_14.10:
     debian: debian
     ccache: true
+    type: docker
 ubuntu_15.04:
     debian: debian
     ccache: true
+    type: docker
 fedora_20:
     spec: ring-daemon.spec
     ccache: true
+    type: docker
 fedora_21:
     spec: ring-daemon.spec
     ccache: true
+    type: docker
 debian_8:
     debian: debian
     ccache: true
+    type: docker
+osx:
+    type: osx