Add Authorixation field to Plugins for Info

The Authorization field lists the plugins for granting access to the
Docker daemon. This field will always be nil for Podman as there is no
daemon. The field is included for compatibility.

```release-note
NONE
```

[NO NEW TESTS NEEDED]

Signed-off-by: Jhon Honce <jhonce@redhat.com>

libpod/define/info.go

@@ -14,7 +14,7 @@ type Info struct {
 	Version    Version                `json:"version"`
 }
 
-// HostInfo describes the libpod host
+// SecurityInfo describes the libpod host
 type SecurityInfo struct {
 	AppArmorEnabled     bool   `json:"apparmorEnabled"`
 	DefaultCapabilities string `json:"capabilities"`
@@ -64,8 +64,7 @@ type RemoteSocket struct {
 	Exists bool   `json:"exists,omitempty"`
 }
 
-// SlirpInfo describes the slirp executable that
-// is being being used.
+// SlirpInfo describes the slirp executable that is being used
 type SlirpInfo struct {
 	Executable string `json:"executable"`
 	Package    string `json:"package"`
@@ -78,8 +77,7 @@ type IDMappings struct {
 	UIDMap []idtools.IDMap `json:"uidmap"`
 }
 
-// DistributionInfo describes the host distribution
-// for libpod
+// DistributionInfo describes the host distribution for libpod
 type DistributionInfo struct {
 	Distribution string `json:"distribution"`
 	Variant      string `json:"variant,omitempty"`
@@ -141,8 +139,8 @@ type Plugins struct {
 	Volume  []string `json:"volume"`
 	Network []string `json:"network"`
 	Log     []string `json:"log"`
-	// FIXME what should we do with Authorization, docker seems to return nothing by default
-	// Authorization []string `json:"authorization"`
+	// Authorization is provided for compatibility, will always be nil as Podman has no daemon
+	Authorization []string `json:"authorization"`
 }
 
 type CPUUsage struct {