fix(local-ear config): moving secret key from /tmp to /etc/scylla/encrypt_conf/
fix(local-ear config): moving secret key from /tmp to /etc/scylla/encrypt_conf/

The file in /tmp/ might be deleted after reboot, this patch moved the
secret keyfile to a safe place.

Signed-off-by: Amos Kong <eb01d8f828a6c9a20be4534e72e049aaf41503df@scylladb.com>

scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-longevity-tests,scylladb/scylla-longevity-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests,scylladb/scylla-cluster-tests