Merge changes I5458127b,Ib36bf44c,I481548e8,I449de193

* changes:
  libsnapshot: Propagate io_uring enablement to daemon
  snapuserd: Cut down worker threads
  snapuserd: Terminate daemon spin up during first stage init
  snapuserd: Avoid checking system properties when daemon launched from fist stage init and during selinux transition