swarm/api: improve FUSE build constraints, logging and APIs (#3818)

* swarm/api: fix build/tests on unsupported platforms

Skip FUSE tests if FUSE is unavailable and change build constraints so
the 'lesser' platforms aren't mentioned explicitly. The test are
compiled on all platforms to prevent regressions in _fallback.go

Also gofmt -w -s because why not.

* internal/web3ext: fix swarmfs wrappers

Remove inputFormatter specifications so users get an error
when passing the wrong number of arguments.

* swarm/api: improve FUSE-related logging and APIs

The API now returns JSON objects instead of strings.
Log messages for invalid arguments are removed.

swarm/api/swarmfs.go

@@ -17,25 +17,22 @@
 package api
 
 import (
-	"time"
 	"sync"
+	"time"
 )
 
 const (
 	Swarmfs_Version = "0.1"
-	mountTimeout   = time.Second * 5
-	maxFuseMounts  = 5
+	mountTimeout    = time.Second * 5
+	maxFuseMounts   = 5
 )
 
-
 type SwarmFS struct {
 	swarmApi     *Api
 	activeMounts map[string]*MountInfo
 	activeLock   *sync.RWMutex
 }
 
-
-
 func NewSwarmFS(api *Api) *SwarmFS {
 	swarmfs := &SwarmFS{
 		swarmApi:     api,
@@ -44,5 +41,3 @@ func NewSwarmFS(api *Api) *SwarmFS {
 	}
 	return swarmfs
 }
-
-