[patch] use collection interfaces in method signatures where possible
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Key: CASSANDRA-3805
URL: https://issues.apache.org/jira/browse/CASSANDRA-3805
Project: Cassandra
Issue Type: Improvement
Components: Core
Reporter: Dave Brosius
Priority: Trivial
Attachments: use_interfaces.diff
Some methods are declared to return or take concrete collection classes when
they don't need that specificity. Converted to collection interfaces, to reduce
cohesion.
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