TEST: Fix version number handling

Fix the shell function version_less_than and associates in the toolbox to
handle -rcN in version numbers correctly so that kernel versions can be
compared.

Signed-off-by: David Howells <dhowells@redhat.com>
DOC: Add get-persistent-keyring manual pages

Add manual pages for keyctl_get_persistent() and keyctl get_persistent.

Signed-off-by: David Howells <dhowells@redhat.com>
TEST: Test for RHBZ 1033467

Test for the problem reported in:

	https://bugzilla.redhat.com/show_bug.cgi?id=1033467

whereby 17 keyrings added into another, previously empty keyring cause a
number of bugs to appear (since the kernel patch to expand keyring capacity).

Signed-off-by: David Howells <dhowells@redhat.com>
TEST: Test for RHBZ 1031154

Test for the problem reported in:

	https://bugzilla.redhat.com/show_bug.cgi?id=1031154

whereby the kernel's attempts to access the shmem file used by a big_key type
to store large data can be denied by the SELinux policy.

Signed-off-by: David Howells <dhowells@redhat.com>