fix(sdcm/remote/libssh2_client/__init__.py): make it show stderr
fix(sdcm/remote/libssh2_client/__init__.py): make it show stderr

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