Make experimental a runtime flag

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>
Upstream-commit: 7781a1bf0fef748877326632b88e92fbf3c90daa
Component: engine

components/engine/docs/reference/api/docker_remote_api.md

@@ -157,7 +157,7 @@ This section lists each version from latest to oldest.  Each listing includes a
 * `POST /containers/prune` prunes stopped containers.
 * `POST /images/prune` prunes unused images.
 * `POST /volumes/prune` prunes unused volumes.
-
+* Every API response now includes a `Docker-Experimental` header specifying if experimental features are enabled (value can be `true` or `false`).
 
 ### v1.24 API changes
 

components/engine/docs/reference/commandline/dockerd.md

@@ -45,6 +45,7 @@ Options:
       --dns-search value                      DNS search domains to use (default [])
       --exec-opt value                        Runtime execution options (default [])
       --exec-root string                      Root directory for execution state files (default "/var/run/docker")
+      --experimental                          Enable experimental features
       --fixed-cidr string                     IPv4 subnet for fixed IPs
       --fixed-cidr-v6 string                  IPv6 subnet for fixed IPs
   -g, --graph string                          Root of the Docker runtime (default "/var/lib/docker")
@@ -1114,6 +1115,7 @@ This is a full example of the allowed configuration options on Linux:
 	"dns-search": [],
 	"exec-opts": [],
 	"exec-root": "",
+	"experimental": false,
 	"storage-driver": "",
 	"storage-opts": [],
 	"labels": [],
@@ -1195,6 +1197,7 @@ This is a full example of the allowed configuration options on Windows:
     "dns-opts": [],
     "dns-search": [],
     "exec-opts": [],
+    "experimental": false,
     "storage-driver": "",
     "storage-opts": [],
     "labels": [],