Increase the retry limit to 20 times and the interval to 200ms (#5134)

The original settings has less tolerance and would fail on some
environments.

models/test_fixtures.go

@@ -5,6 +5,9 @@
 package models
 
 import (
+ "fmt"
+ "time"
+
  "gopkg.in/testfixtures.v2"
 )
 
@@ -21,12 +24,16 @@ func InitFixtures(helper testfixtures.Helper, dir string) (err error) {
 func LoadFixtures() error {
  var err error
  // Database transaction conflicts could occur and result in ROLLBACK
- // As a simple workaround, we just retry 5 times.
- for i := 0; i < 5; i++ {
+ // As a simple workaround, we just retry 20 times.
+ for i := 0; i < 20; i++ {
  err = fixtures.Load()
  if err == nil {
  break
  }
+ time.Sleep(200 * time.Millisecond)
+ }
+ if err != nil {
+ fmt.Printf("LoadFixtures failed after retries: %v\n", err)
  }
  return err
 }