fault_injection_test: bring back 3 iteration runs

Summary: 3 iterations were disabled by mistake by one recent commit, causing CLANG build error. Fix it

Test Plan:
USE_CLANG=1 make fault_injection_test
and run the test

Reviewers: igor

Reviewed By: igor

Subscribers: leveldb, dhruba

Differential Revision: https://reviews.facebook.net/D32109

db/fault_injection_test.cc

@@ -620,6 +620,7 @@ TEST(FaultInjectionTest, FaultTest) {
     Random rnd(301);
     ASSERT_OK(SetUp());
 
+    for (size_t idx = 0; idx < kNumIterations; idx++) {
       int num_pre_sync = rnd.Uniform(kMaxNumValues);
       int num_post_sync = rnd.Uniform(kMaxNumValues);
 
@@ -654,6 +655,7 @@ TEST(FaultInjectionTest, FaultTest) {
         NoWriteTestPreFault();
         NoWriteTestReopenWithFault(kResetDeleteUnsyncedFiles);
       }
+    }
   } while (ChangeOptions());
 }