This commit removes the Kinesis and Firehose sinks, long since disused
by and cernan users I was able to find. The primary motivation is not
the lack of use but the difficulty of upgrading to a new version of
rusoto as we've let this sit for a while.

This commit opens the 0.9.0 series. These sinks will continue to be
supported in the 0.8 series.

Signed-off-by: Brian L. Troutwine <blt@postmates.com>

I'm hunting a leak folks are reporting in k8s-land. The leak, maybe, is
a result of us tracking file limits by lines, rather than by specific byte
totals. The configuration of the file source is now adjusted to use
'max_read_bytes' and not 'max_lines_read' as in 0.8.

Also, I have now removed the explicit dependency on hyper. We rely
entirely on reqwest in the influxdb sink.

Signed-off-by: Brian L. Troutwine <blt@postmates.com>

This commit contains suggestions from clippy, no actual changes
or leak results.

I'm being told that the file change, while helpful, is not resolving
the issue. Which, that implies some other area of unbounded growth.

Signed-off-by: Brian L. Troutwine <blt@postmates.com>

The BufferedPayload reader would allocate any size the user
requested, no matter how large. This is not great, it turns out,
when the user is sending us nonsense. The payloads are now capped
at 1Mb. This should be made configurable.

Signed-off-by: Brian L. Troutwine <blt@postmates.com>