[JDBC] [pgjdbc/pgjdbc] 3883a8: bug: fix false alarm on check coredump (#806)

Branch: refs/heads/master
  Home:   https://github.com/pgjdbc/pgjdbc
  Commit: 3883a846febfe92582be2785737da9460ece1176
      https://github.com/pgjdbc/pgjdbc/commit/3883a846febfe92582be2785737da9460ece1176
  Author: Vladimir Gordiychuk <folyga@gmail.com>
  Date:   2017-04-06 (Thu, 06 Apr 2017)

  Changed paths:
    M .travis/travis_check_postgres_health.sh

  Log Message:
  -----------
  bug: fix false alarm on check coredump (#806)

Find coredump without sudo if it's available. It fix problem that travis
print to stdout not stderr message

```
This job is running on container-based infrastructure, which does not allow use of 'sudo', setuid, and setgid
executables.
If you require sudo, add 'sudo: required' to your .travis.yml
```

that affect command that find corredumps.