Use proper API to ensure default superuser is created #760
Description
Revert specifying superuser by setting SCYLLA_EXT_OPTS (#759) once proper API is implemented in scylla-ccm - scylladb/scylla-ccm#729.
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Revert specifying superuser by setting SCYLLA_EXT_OPTS (#759) once proper API is implemented in scylla-ccm - scylladb/scylla-ccm#729.