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Add sendfile(2) support to streamcache

Jacob Vosmaer requested to merge jv-streamcache-sendfile into master

This will make io.Copy from a streamcache entry into a network socket more efficient. It will not necessarily be faster than a regular io.Copy, but the Gitaly server will spend fewer CPU cycles copying the data.

This is part of gitlab-com/gl-infra/scalability#1217 (closed) and split of from !3758 (merged). Without !3758 (merged), the code in this MR will never be called.

Edited by Jacob Vosmaer

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