virtcontainers: Reduce filesystem test noise

We need to set the context before calling into the API.

Fixes: #1211

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

virtcontainers/filesystem_resource_storage_test.go

@@ -32,6 +32,7 @@ func TestFilesystemCreateAllResourcesSuccessful(t *testing.T) {
 	}
 
 	sandbox := &Sandbox{
+		ctx:        context.Background(),
 		id:         testSandboxID,
 		storage:    fs,
 		config:     sandboxConfig,