Save Reportal project permissions to database

This [change](https://github.com/azkaban/azkaban2/commit/cfef6170369bd015454a0822e8cd01fc7fe70b3f#diff-8fce279a6e7103beaa7385dde810c618R280) caused the fact that Reportal was not saving project permissions to the project_permissions table to surface.  (Reportal was storing project permissions in the project metadata blob.)

- Added code to save Reportal permissions to the project_permissions table in the DB
- Removed an unused method.