Bug 1074633 - RFE: Manage storage node snapshots

Fix StorageNodeComponentItest - basically our tests were running too fast.
Failures happened beause of fact, that lastModified file attribute is stored
in seconds - so our tests tended to generate several snapshots within same
second and that led to incorrect behavior of tested "takeSnapshot"
operation. Several console logging has also been added.
changes. Lines starting

(cherry picked from commit 56c84f19c4e4a39de0d0aea67f4ccdcf905c0b28)
Signed-off-by: Libor Zoubek <lzoubek@redhat.com>