[ISSUE #379] FIX admin subcommand consumeMessage can pull message with timestamp greater than now

[xiaozongyang]

What is the purpose of the change

FIX the issue described in #379 .

Brief changelog

Since the timestamp argument provided to the consumer(beginTimestamp or endTimestamp
) which is later than now is not valid, we should verify them before we actually pull a message from the broker.
And the following are corresponding changes:

• Add verification of command line argument beginTimestamp and endTimestamp
• exit the program if any of the arguments are invalid

By the way, I think we should print report messages in the same style, so I change the messages to capitalized.

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[coveralls]

Coverage increased (+0.08%) to 42.389% when pulling e17cbba on XiaoZYang:fix-consume-from-invalid-time into 3f7dda3 on apache:develop.

[vongosling]

LGTM