* skip node delete from removed member
Signed-off-by: galal-hussein <hussein.galal.ahmed.11@gmail.com>

* use grpc errors
Signed-off-by: galal-hussein <hussein.galal.ahmed.11@gmail.com>

* go imports
Signed-off-by: galal-hussein <hussein.galal.ahmed.11@gmail.com>

* exit if node is the etcd that being removed
Signed-off-by: galal-hussein <hussein.galal.ahmed.11@gmail.com>