external: fix cluster id naming in import-external-cluster script
external: fix cluster id naming in import-external-cluster script

Cluster_ID variable that we export from python script was different
from what we going to use in import script so changed it

Signed-off-by: parth-gr <583be16d1c64273f0f691248fe7345d86bf42e7d@redhat.com>

rook/rook,rook/rook,rook/rook,rook/rook,rook/rook