Swagger refactor/cleanup

* Remove duplicate or unused types and constants
* Move all documetation-only models and responses into swagger package
* Remove all unecessary names, go-swagger will determine names from
  struct declarations
* Use Libpod suffix to differentiate between compat and libpod models
  and responses. Taken from swagger:operation declarations.
* Models and responses that start with lowercase are for swagger use
  only while uppercase are used "as is" in the code and swagger comments
* Used gofumpt on new code

```release-note

```

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

1 files changed, 2 insertions, 6 deletions

diff --git a/pkg/api/handlers/compat/volumes.go b/pkg/api/handlers/compat/volumes.go
index c8e4339b0..ff0a7af02 100644
--- a/pkg/api/handlers/compat/volumes.go
+++ b/pkg/api/handlers/compat/volumes.go
@@ -180,9 +180,7 @@ func CreateVolume(w http.ResponseWriter, r *http.Request) {
 }
 
 func InspectVolume(w http.ResponseWriter, r *http.Request) {
-	var (
-		runtime = r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
-	)
+	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
 	name := utils.GetName(r)
 	vol, err := runtime.GetVolume(name)
 	if err != nil {
@@ -263,9 +261,7 @@ func RemoveVolume(w http.ResponseWriter, r *http.Request) {
 }
 
 func PruneVolumes(w http.ResponseWriter, r *http.Request) {
-	var (
-		runtime = r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
-	)
+	runtime := r.Context().Value(api.RuntimeKey).(*libpod.Runtime)
 	filterMap, err := util.PrepareFilters(r)
 	if err != nil {
 		utils.Error(w, http.StatusInternalServerError, errors.Wrap(err, "Decode()"))