Remove azure driver temporarily

This commit temporarily removes Azure driver and its dependencies
from the source tree and adds dependencies for the new Azure driver
(so that Azure driver PR will not have godeps changes and will be
easier to review).

Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>

libmachine/drivers/plugin/localbinary/plugin.go

@@ -17,7 +17,7 @@ var (
 	// plugin server.
 	defaultTimeout               = 10 * time.Second
 	CurrentBinaryIsDockerMachine = false
-	CoreDrivers                  = [...]string{"amazonec2", "azure", "digitalocean",
+	CoreDrivers                  = [...]string{"amazonec2", "digitalocean",
 		"exoscale", "generic", "google", "hyperv", "none", "openstack",
 		"rackspace", "softlayer", "virtualbox", "vmwarefusion",
 		"vmwarevcloudair", "vmwarevsphere"}