fs: move pipe sysctls to is own file

Everyone keeps stuffing their sysctls to kernel/sysctl.c as if it
was a kitchen sink, and this creates a maintenance burden.

This moves the pipe sysctls to its own file. This is part of the
kernel/sysctl.c spring cleaning.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
3 files changed