Fixes #336
Merge pull request #337 from sudorandom/nas-fix

Use lookup() with NAS datacenter
Skip OS descriptions that cannot be parsed
Increase max statements allowed by pylint :(
Adding list_ecsci function to iscsi manager
Merge pull request #340 from sudorandom/issue-338

Skip OS descriptions that cannot be parsed
Adds pep8-naming to pep8 tests. Adds py3 and py2 pep8 tests
Remove py3 flake8 until the issues can be worked out