The inter-connectedness of RadosStore and RGWRados resulted in a
segfault during RGWRados::init_complete due to the rados pointer not
being set in RadosStore yet.
Split the calls to RGWRados::initialize and RGWRados::init_complete, so
that we can set up RadosStore between them, allowing the services
created in RGWRados::init_complete to access the RadosStore.
Fixes: https://tracker.ceph.com/issues/55512 Signed-off-by: Daniel Gryniewicz <dang@redhat.com>