engine-log-collector - fix exit value on wrong password

Removed too early exception handling that caused an exit with a
wrong exit code (0 instead of 2) when providing a wrong password.

Change-Id: I6df67832c75ba073d73111a0861c9b6e8a6660ed
Bug-Url: https://bugzilla.redhat.com/788993
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>