Move "options(MYSQLI_OPT_LOCAL_INFILE, ...)" call after "real_connect()"

Summary: Fixes T13238. PHP overwrites this setting inside "real_connect()", so we need to apply it after connecting.

Test Plan:

• Locally, tested that "options()" after "real_connect()" works as expected.
• See also PHP upstream bug report: https://bugs.php.net/bug.php?id=77496

Reviewers: amckinley

Reviewed By: amckinley

Maniphest Tasks: T13238

Differential Revision: https://secure.phabricator.com/D20004