System tunables in /etc/sysctl.d/ are not being applied after a reboot.

Issue

• System tunables in /etc/sysctl.d/ are not being applied after a reboot.

• After setting any of the following system tunables via a file in /etc/sysctl.d/ directory and rebooting the still have the following values:

  kernel.sysrq=16
  kernel.core_uses_pid=1
  net.ipv4.conf.default.rp_filter=1
  net.ipv4.conf.default.accept_source_route=0
  fs.protected_hardlinks=1
  fs.protected_symlinks=1
  fs.aio-max-nr = 1048576