Add log collection before setup tear down

[mapuri]

When systemtests fail in CI environment it will be good to collect and store the daemon logs before tearing down the setup. This can help with offline debugging in some cases and avoid having to repro the timing conditions in order to debug.

One possibility:

• Today we create log files for most of the daemons in /tmp directory
• In CI environment, we can tar and copy out the entire directory just before the setup teardown. The CI system can store these files with respective jobs.