Add support for Names and ID in stats format

This adds support to display names or id of container instead of what
was provided in the request.

This keeps the default behavior (`docker stats byname` will display
`byname` in the `CONTAINER` colmun and `docker stats byid` will display
the id in the `CONTAINER` column) but adds two new format directive.

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

api/types/stats.go

@@ -170,6 +170,9 @@ type Stats struct {
 type StatsJSON struct {
 	Stats
 
+	Name string `json:"name,omitempty"`
+	ID   string `json:"id,omitempty"`
+
 	// Networks request version >=1.21
 	Networks map[string]NetworkStats `json:"networks,omitempty"`
 }