Update the syslog_aggregator job to use vendor nats
Revert "Update the syslog_aggregator job to use vendor nats"

This reverts commit cdd0ababd1b011782822c9d192b19a5f19894a35.
Revert "Fix loggregator multi-AZ proxying"

This reverts commit 67e16235d3157a0e3d31e7af0751087981205b19.