add daemon labels

Signed-off-by: Victor Vieux <vieux@docker.com>

docs/sources/reference/api/docker_remote_api.md

@@ -50,7 +50,8 @@ You can still call an old version of the API using
 
 **New!**
 `info` now returns the number of CPUs available on the machine (`NCPU`),
-total memory available (`MemTotal`), a user-friendly name describing the running Docker daemon (`Name`), and a unique ID identifying the daemon (`ID`).
+total memory available (`MemTotal`), a user-friendly name describing the running Docker daemon (`Name`), a unique ID identifying the daemon (`ID`), and
+a list of daemon labels (`Labels`).
 
 `POST /containers/create`
 

docs/sources/reference/api/docker_remote_api_v1.16.md

@@ -1230,7 +1230,8 @@ Display system-wide information
              "IndexServerAddress":["https://index.docker.io/v1/"],
              "MemoryLimit":true,
              "SwapLimit":false,
-             "IPv4Forwarding":true
+             "IPv4Forwarding":true,
+             "Labels":["storage=ssd"]
         }
 
 Status Codes: