Hotfix reduce socket pool size to 1
- context: we think that introducing parallelism upstream of signald might be exacerbating its concurrency bugs (getting lots of concurrent modification errors)
- experiment: reduce socket pool size for connections between signalboost and signald to 1 to see if it mitigates concurrency bugs. (if it works, consider dialing the pool size up gradually)
side-effect: cleanup number re-registration playbook