net-mgmt/py-pyeapi: Update to 0.8.3

• Make USES block separate from non-related variables (as it should be done for every block according to the PHB).
• Add "do-test" target to make future QA easier.

Changelog:

• Support eapi command revision syntax
• Add ability to use pyeapi with certificates
• Added check for 'match' statement to be valid before parsing regex ACL