role_management_statement: Make validate_cluster_support() accept query_processor
role_management_statement: Make validate_cluster_support() accept query_processor

Patch internal role_management_statement's methods to use query_processor

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@scylladb.com>

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla