cli: Add gitaly-bench coordinator
Currently we use Ansible to run benchmarks against Gitaly, but this
requires us to run benchmarks serially. Ansible cannot divide a group of
tasks between hosts, so we're limited to a single Gitaly host. The goal
of this tool is to enable us to create n
Gitaly hosts and run
benchmarks in parallel against them.
Add a new gitaly-bench
binary to allow us to coordinate starting and stopping Gitaly for benchmarking.
Related to #4831
Edited by Will Chandler