This allows to set `STORJ_TEST_MONKIT` to either
`svg` or `json` to write individual testplanet test
traces to disk.
It also allows to specify an absolute directory:
STORJ_TEST_MONKIT=svg,dir:/abs/dir/path
It requires an absolute path, because from the context of
tests, there's no easy way to find the folder where tests
were called.
Change-Id: I6fe008a4d4237d221cf5a5bede798b46399ee197
Each test log is starting with warnings like this: "rollout config
error: empty seed {"binary": "Identity"}". Make no sense to print them
and pollute output.
Change-Id: Ib50e28d09d8b259106d3b79d8f1262954a7aed63
