Revert "[milo] Use commit range for blame calculation in gRPC endpoint"
Revert "[milo] Use commit range for blame calculation in gRPC endpoint"

This reverts commit 13ef8d8a1164644b7cf53ebbe1113438f1fe7f36.

Reason for revert: invalid change. The parameter to git.Log is a ref or a single commit, not a rev..rev range. Range request are not as much cachable. There was a spike of cache misses: http://shortn/_6e08hdkBjB

Original change's description:
> [milo] Use commit range for blame calculation in gRPC endpoint
> 
> Instead of just getting the past 50 revs
> 
> Bug: 821287
> Change-Id: Ia7b6b6fbdf10fa4a9bca6bfd1d7ea678813553d8
> Reviewed-on: https://chromium-review.googlesource.com/961224
> Reviewed-by: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
> Commit-Queue: Ryan Tseng <hinoka@chromium.org>

TBR=hinoka@chromium.org,ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org

Change-Id: I8e5177ba7b010979676a778cbbe5a60c0fa15412
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 821287
Reviewed-on: https://chromium-review.googlesource.com/961346
Reviewed-by: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>
Commit-Queue: Nodir Turakulov <ef4933a197ef7b4b3f55f1bec4942aead3637a2a@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go