Gracefully shutdown

[alok87]

All routines should begin from where it last left off and should shutdown gracefully. We need the consumers to be really accurate on this.

Even though the system is idempotent let's make the consumers rock solid.

More Info: IBM/sarama#1776

TODO:

• If the batching library also handles context based signals it can prevent earlier shutdown and few more calls (many of the lage is huge) Context Support herryg91/gobatch#2