Add raising exception if there are undefined environment variables
Remove license text from empty __init__ files
Move clear_nexus_config.py to tools folder
Move parser variable from global scope to inside if body
Do not use os.path.join for defining tempest path
Switch from localrc to localconf
Add except handlers
refactore tempest_last2html method of DevStack class

It uses requests to get subunit2html.py content
Use exists method os the fabric
The clear_nexus_config should return something but not to stop execution
Fix hasrdcoded nic name
remove NEUTRON_PROCESSES variable