Fixing flakey staging logs test

- Instead of expecting all 3 log messages we're expecting one of the three.
  This is because the current implementation causes non-deterministic output.

[#70691526]

Signed-off-by: Michael Fraenkel <fraenkel@us.ibm.com>
Extracting Godep env setup into its own script file

Signed-off-by: Michael Fraenkel <fraenkel@us.ibm.com>