Change RedisServerCommands.getConfig() result to Properties [DATAREDIS-661]

[spring-projects-issues]

Mark Paluch opened DATAREDIS-661 and commented

Migrate from List<String> (containing ordered key-value pairs) to Properties response to improve client handling of configuration properties

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Issue Links:

• DATAREDIS-273 RedisServerCommands.getConfig should return Properties instead of List
  ("supersedes")

Referenced from: pull request #255, and commits 8f88b78, 47b4468, 4fc58ad, 2e151c7