Add security info to docker info

The security infomation has already been added to `GET /info` in #21172.
However, it is not part of the output of `docker info` yet.

This fix adds the security information to `docker info`.

Additional tests has been added to cover changes.

This fix fixes #23500. This fix is related to #20909, #21172.

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

integration-cli/docker_cli_info_unix_test.go

@@ -0,0 +1,15 @@
+// +build !windows
+
+package main
+
+import (
+	"github.com/docker/docker/pkg/integration/checker"
+	"github.com/go-check/check"
+)
+
+func (s *DockerSuite) TestInfoSecurityOptions(c *check.C) {
+	testRequires(c, SameHostDaemon, seccompEnabled, Apparmor, DaemonIsLinux)
+
+	out, _ := dockerCmd(c, "info")
+	c.Assert(out, checker.Contains, "Security Options: apparmor seccomp")
+}