ssl_conf: fix error in overwrite subdirectory
ssl_conf: fix error in overwrite subdirectory

In the past, self.node_config_setup() will be called only once. I saw
clean_replacement_node_ip() would repeatedly call self.node_config_setup().
After merged PR #625, clean_replacement_node_ip() won't be used. So issue
 #624 won't occur.

This patch only ignored subdirectory in moving the files.

Fixes #624

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

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