Moved scrubbing of nv cache to core thread. Added IO channel which is
used in user context, during shutdown of nv cache.
Signed-off-by: Mateusz Kozlowski <mateusz.kozlowski@intel.com>
Change-Id: I88e680324e361bf7e0c0a9a9d29323f179c56e3b
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/465932
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>