[Fixes #109] Bug: Unable set keywords on geonode_objects when defining keyword via API

[mwallschlaeger]

Description

This code changes will allow users to set keywords to datasets, maps and other geonode objects via the API using syntax like e.g.
geonodectl ds patch 2 --set '{ "keywords": [ {"name" : "test2"}, {"name": "test"}] }'

Type of Change

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• Bug fix
• New feature
• Documentation update
• Refactoring
• Other (please describe)

Related Issue

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closes #109

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