- Added/Updated headers
- Added script to update copyright headers

- Added RequestSlice to Interdomain
- Separated Create and Update in Slice

- formatted and corrected interdomain and slice proto files
- regenerated associated Python code files per component

Policy component's protobufs are updated based upon
the Event Condition Action (ECA) model.
Minor fixes are applied to the slice.proto in order
to compile.

Signed-off-by: Georgios Katsikas <katsikas.gp@gmail.com>