[yt-dev] Issue #833: parallel_capable getting reset to False running in parallel (yt_analysis/yt)

[Britton Smith]

New issue 833: parallel_capable getting reset to False running in parallel
https://bitbucket.org/yt_analysis/yt/issue/833/parallel_capable-getting-reset-to-false

Britton Smith:

The parallel_capable global variable is getting reset to False somewhere, causing decorators like parallel_root_only not to work correctly.  This can be reproduced by either of the following scripts run in parallel:
```
#!python

import yt
yt.enable_parallelism()
pf = yt.load("DD0064/DD0064")

from yt.mods import *
pf = load("DD0064/DD0064")
```