Adding extensibility to table actions template.

Fixes bug 1174973

Change-Id: I2f8ab17e7066ff8b2d31afdc796b95a0c834abc1
Shortens displayed action names in Floating IPs table

Fixes: bug #1065375
Change-Id: I4f7416aaf6c6f9e67a95e3728018848975535071
Move to flake8.

The project is standardizing on flake8 for static code analysis.

Change-Id: I4fd97b56b6c6cb57e8d245281e0da15f838ec840
Merge "Adding extensibility to table actions template."
Merge "Move to flake8."
Merge "Shortens displayed action names in Floating IPs table"