module refactoring of pure-python modules

[rhysmeister]

SUMMARY

Applies to the following modules...

• cassandra_keyspace
• cassandra_table
• cassandra_role

There are probably a few things that can be refactored into module_utils and/or doc_fragments for these modules. For example parameter common to these modules, validation code that is shared scross these modules, other duplicated stuff across these modules. We've already done this for nodetool based modules but not these pure-python ones.

ISSUE TYPE

• Feature Idea