Remove any behavior flags that facilitate backwards compatibility

[corranrogue9]

We have many flags that we have introduced to maintain backwards compatibility but allow customers to take a new behavior if they want it. We should remove them. If we can't remove them due to compatibility with other versions of ODL, we should switch the default behavior. We should be very clear in the release notes of which behaviors have new defaults.

[ElizabethOkerio]

@corranrogue9 is there any documentation on these behavior flags?