suites/yp: remove some debug output

Signed-off-by: Olaf Kirch <okir@suse.de>
Updated selftest code to allow arbitrary nesting of test groups

Signed-off-by: Olaf Kirch <okir@suse.de>
renamed a few testbus_* shell script functions

Signed-off-by: Olaf Kirch <okir@suse.de>
start-kvm-guest: --add-rpm can now take a directory as an argument

Signed-off-by: Olaf Kirch <okir@suse.de>