Add additional section to the SELinux documentation to describe how to
collect debug information when SELinux issues are encountered. This is
purely a documentation change.
Note: Merged seperate from SELinux Policy change in case policy change
needs to be cherry-picked to older releases.
Change-Id: I7ba3d3c7d84171b503d956eb01e13a680b4d53fc
Signed-off-by: Billy McFall <bmcfall@redhat.com>