merge load/save test functions

The GenKeyP2P actually generated different keys on different hosts,
given the same seeds. So we can't hardcode the generated string based on
the test running the local host.

Signed-off-by: Leo Chen <leo@harmony.one>

internal/utils/utils_test.go

@@ -100,12 +100,8 @@ func TestGetUniqueIDFromIPPort(t *testing.T) {
 	assert.Equal(t, GetUniqueIDFromIPPort("1.1.1.1", "123"), uint32(1111123), "should be equal to 1111123")
 }
 
-var (
-	savedKey = "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"
-)
-
-// Test for SavePrivateKey function
-func TestSavePrivateKey(t *testing.T) {
+// Test for SavePrivateKey/LoadPrivateKey functions
+func TestSaveLoadPrivateKey(t *testing.T) {
 	pk, _, err := GenKeyP2P("127.0.0.1", "8888")
 	if err != nil {
 		t.Fatalf("failed to generate p2p key: %v", err)
@@ -114,23 +110,12 @@ func TestSavePrivateKey(t *testing.T) {
 	if err != nil {
 		t.Fatalf("failed to save private key: %v", err)
 	}
-	if str != savedKey {
-		t.Errorf("key is not right")
-		t.Errorf("got: %s", str)
-		t.Errorf("expecting: %s", savedKey)
-	}
-}
 
-// Test for LoadPrivateKey function
-func TestLoadPrivateKey(t *testing.T) {
-	pk, _, err := GenKeyP2P("127.0.0.1", "8888")
-	if err != nil {
-		t.Fatalf("failed to generate p2p key: %v", err)
-	}
-	pk1, err := LoadPrivateKey(savedKey)
+	pk1, err := LoadPrivateKey(str)
 	if err != nil {
 		t.Fatalf("failed to load key: %v", err)
 	}
+
 	if !crypto.KeyEqual(pk, *pk1) {
 		t.Errorf("loaded key is not right")
 		b1, _ := pk.Bytes()