add selinux plugin

This patch adds an selinux plugin that sets up an environment with
selinux turned *off* in the build chroot. How does this work? From the
author's description:

It is done the same as the patch sent by Thomas Liu in bz 614440 does.
Actually, this proceeding was suggested by Dan Walsh in bz 573111.

1.) Fake /proc/filesystems is created in conf["cachedir"]. It includes the
same content as the same file in host environment, except line with selinuxfs.
This file is bind mounted into build environment.

2.) Option '--setopt=tsflags=nocontext' is added to yum commands. This is done
by wrapping mock.util.do with _selinuxDoYum in "preyum" hook. This function
just adds the option and passes the command to original mock.util.do function.
The wrapping is removed in "postyum" hook.
I didn't find cleaner method, without modifying main code.

Signed-off-by: Clark Williams <williams@redhat.com>

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