GOLD-645: Change TopLevelView into a DRF View.
GOLD-645: Change TopLevelView into a DRF View.

This reverts commit e292bc19ebd819347faeb3e5e013cecb947db6e6.

slashk/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,slashk/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,Solinea/goldstone-server,slashk/goldstone-server,slashk/goldstone-server