Fix several issues in scenario test to get them stable again:
- The SSH timeout was set to 80 seconds what is way too low for an
Nova instance to come up in the gate.
- Scenario test access rule cleanup is not necessary, access rules
are deleted when share instance is deleted.
Co-Authored-By: Rodrigo Barbieri <rodrigo.barbieri@fit-tecnologia.org.br>
Closes-bug #1545715
Change-Id: I9f22f0416bb248666fe906e1ca653517054f21b5