Add conditional services based on mobyplatform

Replaces https://github.com/docker/moby/pull/282

Use mobyplatform=xxx to specify platform in boot command

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

docs/platforms.md

@@ -0,0 +1,23 @@
+## List of platforms
+
+These are the supported platforms. Each should boot with `mobyplatform=xxx` in the command line.
+
+### Desktop
+`mac`
+`windows`
+
+https://github.com/docker/pinata
+
+### Cloud
+`aws`
+`azure`
+
+https://github.com/docker/editions
+
+### Test
+`test`
+
+https://github.com/docker/moby
+
+### Other
+KVM/machine https://github.com/docker/moby/pull/225