Capture os signals to gracefully shutdown fission components (#2261)

- Currently, fission components don't handle shutdown signals.
So we don't get any to do the required cleanup before the fission process
exits. Adding signal capture process with cancelling context so
that all dependent processes stop working when the process gets term
signal.
- Set log level to error in otel shutdown function

Signed-off-by: Sanket Sudake <sanketsudake@gmail.com>

pkg/storagesvc/client/storagesvc_test.go

@@ -76,7 +76,7 @@ func runMinioDockerContainer(pool *dockertest.Pool) *dockertest.Resource {
 	return resource
 }
 
-func startS3StorageService(endpoint, bucketName, subDir string) {
+func startS3StorageService(ctx context.Context, endpoint, bucketName, subDir string) {
 	// testID := uniuri.NewLen(8)
 	port := 8081
 
@@ -94,7 +94,7 @@ func startS3StorageService(endpoint, bucketName, subDir string) {
 	os.Setenv("STORAGE_S3_REGION", minioRegion)
 
 	storage := storagesvc.NewS3Storage()
-	_ = storagesvc.Start(logger, storage, port, true)
+	_ = storagesvc.Start(ctx, logger, storage, port, true)
 }
 
 func TestS3StorageService(t *testing.T) {
@@ -135,7 +135,7 @@ func TestS3StorageService(t *testing.T) {
 	// Start storagesvc
 	bucketName := "test-s3-service"
 	subDir := "x/y/z"
-	startS3StorageService(endpoint, bucketName, subDir)
+	startS3StorageService(context.Background(), endpoint, bucketName, subDir)
 
 	time.Sleep(time.Second)
 	client := MakeClient(fmt.Sprintf("http://localhost:%v/", 8081))
@@ -211,7 +211,7 @@ func TestLocalStorageService(t *testing.T) {
 	localPath := fmt.Sprintf("/tmp/%v", testID)
 	_ = os.Mkdir(localPath, os.ModePerm)
 	storage := storagesvc.NewLocalStorage(localPath)
-	_ = storagesvc.Start(logger, storage, port, true)
+	_ = storagesvc.Start(context.Background(), logger, storage, port, true)
 
 	time.Sleep(time.Second)
 	client := MakeClient(fmt.Sprintf("http://localhost:%v/", port))