* stable-6.3:
[benchmarks] Remove profiler configuration
Add SHA1 benchmark
[benchmarks] Set version of maven-compiler-plugin to 3.8.1
Fix running JMH benchmarks
Add option to allow using JDK's SHA1 implementation
Fix API breakage caused by extracting WorkTreeUpdater
Extract Exception -> HTTP status code mapping for reuse
Don't handle internal git errors as an HTTP error
Ignore IllegalStateException if JVM is already shutting down
Allow to perform PackedBatchRefUpdate without locking loose refs
Change-Id: Ib58879be292c54a2a7f4936ac0986997985c822b