Replace remove_base() function by smaller ones:
detach_cache(), remove_cache_bdev(),
detach_core(), remove_core_bdev()
This change is necessary for implementing asynchronous unregister using
trylock API.
Also introduce stop status variable because unregister path has changed.
Change-Id: I62599cafacdba685848bd7d32d3d5245907ee4a1
Signed-off-by: Vitaliy Mysak <vitaliy.mysak@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/452416
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>