fix #23017, add zsh completion for dockerd

Signed-off-by: Ke Xu <leonhartx.k@gmail.com>
(cherry picked from commit bd1fc1e5c26b954fb35f7adda46d764d80a1a570)

contrib/completion/zsh/_docker

@@ -1,4 +1,4 @@
-#compdef docker
+#compdef docker dockerd
 #
 # zsh completion for docker (http://docker.com)
 #
@@ -1410,6 +1410,13 @@ _docker() {
     return ret
 }
 
+_dockerd() {
+    integer ret=1
+    words[1]='daemon'
+    __docker_subcommand && ret=0
+    return ret
+}
+
 _docker "$@"
 
 # Local Variables: