selinux: add option to control checking of reply messages

Currently all reply messages are checked with the same SELinux
permission as request messages ("send_mesg").
Add an option <replycheck> to be able to use a distinc SELinux
permission for reply messages.
11 jobs for selinux_replycheck in 7 minutes and 29 seconds (queued for 3 seconds)
latest
Status Job ID Name Coverage
  Build
passed #6367747
build:cmake

00:03:11

passed #6367744
build:debug

00:07:21

manual #6367749
allowed to fail manual
build:i686-w64-mingw32-cmake
passed #6367748
build:i686-w64-mingw32-debug

00:04:23

manual #6367746
allowed to fail manual
build:legacy
passed #6367743
build:production

00:05:09

manual #6367745
allowed to fail manual
build:reduced
manual #6367752
allowed to fail manual
build:stretch
passed #6367750
build:x86_64-w64-mingw32

00:03:56

passed #6367751
build:x86_64-w64-mingw32-cmake-debug

00:07:27

manual #6367753
allowed to fail manual
build:xenial