Support setting vpc flow log retention time

[mikkeloscar]

Add support for setting a retention time on the log group used for vpc flow logs.

If nothing is specified in the config file it will default to 3653 days (10 years) which is the highest retention in days if you don't specify never expire which was the default for us so far.

The idea would be to set this to a lower value as per our internal requirements.

[codecov-commenter]

Codecov Report

Merging #112 (1846777) into master (bc3ee9b) will decrease coverage by 0.04%. The diff coverage is 10.00%.

@@            Coverage Diff             @@
##           master     #112      +/-   ##
==========================================
- Coverage   24.50%   24.45%   -0.05%     
==========================================
  Files          25       25              
  Lines        2110     2114       +4     
==========================================
  Hits          517      517              
- Misses       1593     1597       +4     

Impacted Files	Coverage Δ
sevenseconds/config/configure.py	26.47% <0.00%> (ø)
sevenseconds/config/cloudwatch.py	9.09% <11.11%> (-5.20%)	:arrow_down:

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[coveralls]

Coverage decreased (-0.05%) to 24.456% when pulling 1846777919f32aeb1d9964ab7eb061564366885d on vpc-flow-log-retention into bc3ee9b9fa9dcef366e9b22f105947fc57f6f8ce on master.

[zalando-robot]

Docker image "pierone.stups.zalan.do/teapot/sevenseconds-release-pr:112" is not based on an approved base image. Any production deployment relying on this image will be blocked.

To create a compliant Docker image of your application, you must reference an allowed Docker image as its base image in your Dockerfile. This base image must come from the Open Source Registry namespace library and use a recommended version as listed in the documentation.

[aermakov-zalando]

👍

[mikkeloscar]

:+1: