use poll instead of select in TSocket

use poll instead of select in TSocket

Summary: fd_set, which we pass into select only supports  fds with values < 1024.
         fds can be >= 1024.
         this can cause memory corruption

         learning this stuff over 2 weeks of examining crazy core dumps is way more fun that reading it up somewhere.

         poll takes an array of fds insetad, so your fd can be any int

Reviewed By: dreiss

Test Plan: ran inside a test search cluster

Revert: OK

DiffCamp Revision: 10731

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665647 13f79535-47bb-0310-9956-ffa450edef68