Revert "staticd: Accept full blackhole typed keywords for ip_route_cmd"

Revert "staticd: Accept full blackhole typed keywords for ip_route_cmd"

This reverts commit 76b2bc97e73874d882d5cf021972cfca84656cef.

This change is wrong for several reasons:
- it is backwards incompatible - previously it was always possible to
  create blackhole/reject routes using shortened versions of the words
  and it suddenly became impossible if there's an interface in the
  system with the same name
- it uses operational data for validation which is prohibited
- it doesn't really solve the problem with inability to create routes
  using interface names like `bla` or `rej`