vhive-serverless/invitro

Scraping metrics scripts are potentially slow

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    How heavyweight is this blocking call? Could it complete within a second if that it the metrics scrapping period?

Originally posted by @cvetkovic in #109 (comment)

Current implementation of metric collection jumps all around go, python, bash.
Since kubectl, prometheous all have api for go, we should rewrite everything in go for faster execution and better concurrency and error handling.