engine: same exception is logged multiple times in engine log

In order to remove multiple places where information are logged new
runtime exception was introduced and VDSCommandBase do not log any
information for it in the catch block.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=982686
Change-Id: Icbc476f1f5799967e5776ede3dcfd462eada2ce9
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>