Packages cannot be loaded as part of an initial migration

[bferguso]

There are 2 issues that cause the failure of a package to be loaded as part of a setup_db call:

1. The load_package option of the packages management command makes a call to the refresh_geojson_geometries() postgres function, which fails if it is within a transaction. This causes the migration to fail from a migration as it is in a transaction.
2. the management.call_command("createcachetable") call happens after the management.call_command("migrate") call in the setup_db management command. This causes errors when loading the package graphs because the process tries to delete rows from the user_permission_cache table which is not present until after the migration completes.

Fixing these two issues will allow a package to be loaded as part of an initial migration.