Guard for worlddump in case LOGDIR is undefined

If LOGDIR is undefined, we'll end up calling worldump with the `-d` option but
pass in an empty string as the option value. This causes an argument parsing
error inside worlddump.

The proposed fix is to detect if LOGDIR is undefined, and if so, omit the `-d`
argument.

Change-Id: I77968849ebd3e3bebd2e5929b87b60fc1b6541bf
Closes-Bug: 1333321
Rename Marconi to Zaqar

This patch changes all Marconi references to Zaqar.

Change-Id: Iec4aeca54c0f383c995fba564bc59daa550d3747
Implements: blueprint project-rename
Merge "Guard for worlddump in case LOGDIR is undefined"