Fixing typos in tempest/test.py

Corrected misspelled words located in comments of functions
get_tenant_network,set_resource, and tearDownClass.  This will help to
avoid any confusion when someone is reading comments for clarification.

Change-Id: I90a44e46ce0fad03416b3efcc3c6bb67986e94d3
Closes-Bug: 1541020
1 file changed