[docs] Add short troubleshooting note about nscd
[docs] Add short troubleshooting note about nscd

Change-Id: I9ace99c33d9161a0878c7c7570313ca5f895a7a9
Reviewed-on: http://gerrit.cloudera.org:8080/10498
Reviewed-by: Andrew Wong <b68e4fdc6430321a6b47400732ff97d7ae91234e@cloudera.com>
Tested-by: Will Berkeley <c74686ab413a71926fc1bc9d16ebfa30e619336a@gmail.com>

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