PROBLEM: Consumer offset was resetting to the latest index rather than the earliest
SOLUTION: Modified consumer creation to include `auto_offset_reset="smallest"` which
allows the offset to reset to the earliest known index.
NOTE: This does exactly what the whence parameter in SimpleConsumer.seek()
is expected to do, however in order to achieve this functionality,
the parameter `auto_offset_reset` MUST be set to either "largest"
or "smallest".
Change-Id: I887892d80f2da9619c7f11737b3ab2e1d1dacf1e