Bug 2129: Fix logic to always delete VM

Puts the step to extract the container logs into a try/catch block
so that the logic to delete the VM and stop the apache container
will always execute, instead of leaving them behind on error.

Fixes bug 2129

Change-Id: If252670b5374f1665f0e8b649b9fbc16c1ff2705
Signed-off-by: Mark Beierl <mark.beierl@canonical.com>