`wandb.init` does not play well under `bazel test`

• Weights and Biases version: wandb, version 0.9.1
• Python version: Python 3.6.9
• Operating System: Linux

Description

Just trying to put our usages of wandb.init under bazel test.

However, when we do that, we get the following:

Traceback (most recent call last):
  File "{runfiles}/wandb_examples/
test/wandb_stub_test.py", line 48, in test_wandb
    wandb.init(project="test_project", sync_tensorboard=True)
  File "{execroot}/wandb_examples/venv/lib/python3.6/site-packages/wandb/__init__.py", line 1129, in init
    _init_headless(run, False)
  File "{execroot}/wandb_examples/venv/lib/python3.6/site-packages/wandb/__init__.py", line 259, in _init_headless
    stdout_master_fd, stdout_slave_fd = io_wrap.wandb_pty(resize=False)
  File "{execroot}/wandb_examples/venv/lib/python3.6/site-packages/wandb/io_wrap.py", line 157, in wandb_pty
    master_fd, slave_fd = pty.openpty()
  File "/usr/lib/python3.6/pty.py", line 29, in openpty
    master_fd, slave_name = _open_terminal()
  File "/usr/lib/python3.6/pty.py", line 59, in _open_terminal
    raise OSError('out of pty devices')
OSError: out of pty devices

What I Did

See this repro/.../README section: https://github.com/EricCousineau-TRI/repro/tree/3cc6aa5ba70e306b3b1a1660f3f59c07b1eca12d/python/wandb_examples#wandb-and-bazel-test

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[EricCousineau-TRI]

Confirmed that it works! https://github.com/EricCousineau-TRI/repro/commit/583acd21