[hhvm/test/run] script enhancements

1. Added -i option to include only certain tests to be executed.

Example and output below
```
bash$ hphp/test/run -v -m jit -r zend -i tests/bug335
Running 7 tests in 5 threads
hphp/test/zend/good/Zend/tests/bug33558.php passed
hphp/test/zend/good/Zend/tests/bug33512.php passed
hphp/test/zend/good/ext/date/tests/bug33536.php passed
hphp/test/zend/good/ext/date/tests/bug33562.php passed
hphp/test/zend/good/ext/date/tests/bug33532.php passed
hphp/test/zend/good/ext/date/tests/bug33578.php passed
hphp/test/zend/good/ext/date/tests/bug33563.php passed

All tests passed.

              |    |    |
             )_)  )_)  )_)
            )___))___))___)\
           )____)____)_____)\
         _____|____|____|____\\__
---------\      SHIP IT      /---------
  ^^^^^ ^^^^^^^^^^^^^^^^^^^^^
    ^^^^      ^^^^     ^^^    ^^
         ^^^^      ^^^

```

2. Print the `norepo` reason next to skipped message for tests with .norepo file

```
bash$ hphp/test/run -v -m jit -r zend -i tests/bug338
Running 3 tests in 3 threads
hphp/test/zend/good/ext/pdo_sqlite/tests/bug33841.php skipped norepo
hphp/test/zend/good/Zend/tests/bug33802.php passed
hphp/test/zend/good/ext/date/tests/bug33869.php passed

All tests passed.

              |    |    |
             )_)  )_)  )_)
            )___))___))___)\
           )____)____)_____)\
         _____|____|____|____\\__
---------\      SHIP IT      /---------
  ^^^^^ ^^^^^^^^^^^^^^^^^^^^^
    ^^^^      ^^^^     ^^^    ^^
         ^^^^      ^^^

```