Tests fail after one run due to undeletable output.json file

[MrCreosote]

======================================================================
ERROR: test_run (test.test_dockerrunner.DockerRunnerTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/stuff/github/kbase/JobRunner/test/test_dockerrunner.py", line 62, in test_run
    os.remove(of)
PermissionError: [Errno 1] Operation not permitted: '/tmp/output.json'

$ ls -l /tmp/output.json 
-rw-r--r-- 1 root root 2900 Jul 18 16:54 /tmp/output.json

[MrCreosote]

Workaround is to delete it manually