Allow rngd process to drop privileges with "-D user:group"
Fix an error building with jitterentropy-3.4.0
Add a requirement for selinux-policy of a certain version
Fix a build failure on ppc64
Small edits in test scripts
Resolves: rhbz#2075977
Signed-off-by: Vladis Dronov <vdronov@redhat.com>