Adding optional regex segment to parse vpc flow logs with hourly partition to fix grafana/lambda-promtail#9

[BhruguR]

Fixes #9

All I am doing is simply adding an optional regex segment to parse VPC flow logs with hourly partition.

The regex concerned here is (?:(?P<hour>\d+)\/)?:

• ?: makes sure we do not keep track of something like 20/ as that is what the outer group is matching
• ?P adding an 'hour' named group
• \d+ While d{2} would have been the better option, I am trying to follow the format that other calendar expressions are using
• / VPC flow logs with hourly partition will have a number like 20/ which we will have to match.

Tests

I have added a unit test to test this change, and I have locally tested this change in my aws account using terraform successfully.

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[BhruguR]

@jeschkies Can you please take a look when you get a chance (no rush)? I am very eager to have this merged!