Revert "ctdb-common: Use SCHED_RESET_ON_FORK when setting SCHED_FIFO"

Revert "ctdb-common: Use SCHED_RESET_ON_FORK when setting SCHED_FIFO"

BUG: https://bugzilla.samba.org/show_bug.cgi?id=12392

Feature SCHED_RESET_ON_FORK is completely broken on RHEL6 and RHEL7
distributions.  So do not rely on SCHED_RESET_ON_FORK for now.

This reverts commit 1be8564e553ce044426dbe7b3987edf514832940.

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Tue Oct 25 11:28:28 CEST 2016 on sn-devel-144

(cherry picked from commit 71b69b0169dc6e2843325f1567f64b6acd43e6b8)