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Removes 'rwx' permissions for global users

- the tests make an assumption that the permissions on the /tmp dir have not
been altered
Signed-off-by: Brenda Chan <brchan@pivotal.io>



**What this PR does / why we need it**:

This PR modifies a conformance test that checks the file permissions when the`/tmp` dir is mounted.

The current tests make an assumption that the permissions on the `/tmp` dir on the host system has not been altered. We removed the check that global users need `rwx`, so the tests now only check for `dtrwxrwx`


**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: N/A

**Special notes for your reviewer**: N/A

**Release note**:

```release-note
NONE
```