[sql] Import reference version of SQLite 3.10.2.

third_party/sqlite/sqlite-src-3100200/test/crashtest1.c

 /*
 ** This program tests the ability of SQLite database to recover from a crash.
 ** This program runs under Unix only, but the results are applicable to all
 ** systems.
 **
 ** The main process first constructs a test database, then starts creating
 ** subprocesses that write to that database.  Each subprocess is killed off,
 ** without a chance to clean up its database connection, after a random
 ** delay.  This killing of the subprocesses simulates a crash or power
 ** failure.  The next subprocess to open the database should rollback
@@ skipping 76 matching lines @@
       do_some_sql(parent);
       return 0;
     }
     printf("test %d, pid=%d\n", i, pid);
     usleep(rand()%10000 + 1000);
     kill(pid, SIGKILL);
     waitpid(pid, &status, 0);
   }
   return 0;
 }