IMPALA-371 The shell should warn the user that set has no effect while disconnected.
IMPALA-371 The shell should warn the user that set has no effect while disconnected.

Change-Id: I4b8c3737613007d8ae7253d909765e1a659717c9
Reviewed-on: http://gerrit.ent.cloudera.com:8080/945
Reviewed-by: Ishaan Joshi <d1d1e60202ec9f2503deb1b724986485a125d802@cloudera.com>
Tested-by: Ishaan Joshi <d1d1e60202ec9f2503deb1b724986485a125d802@cloudera.com>

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