Only opens first few ALB logs when using Node 4.6

[jacobischwartz]

Node 4.6's zlib seems to have a bug where only the first stream is returned in multi-stream gzip files. Here's some discussion:
nodejs/node#5120

I don't know if AWS recently started concatenating ALB gzip log files, but I found that in a log file of several hundred requests, only the first couple requests were making it into Cloudwatch Logs.

If I download, uncompress, recompress, then re-upload to S3, all requests are parsed.

Also, just switching to Node 6.10 in Lambda solves the problem.