Updated hdp_plugin features to align with current capabilties

* Minor re-write of Swift integration feature
* Extracted plugin capabilities into an easy to update/view table

Co-Authored-By: Alexander Ignatov <aignatov@mirantis.com>

Partially Implements: blueprint  update-docs-icehouse

Change-Id: I4014e9549467b4ad3d3fe888aad98e1079796013