bump loggregator

a953ce0 Trying to reconnect to the gnats server in case it fails the first time.
46d33aa sync bosh packages
671e704 Traffic controller integration test now uses fake router instead of spawning a gorouter process
3e6cdce bump noaa
9458526 Remove autowire usages.
fb92120 bump loggregatorlib
b4d6963 Emit varz metrics for syslog drain failures
e986443 Refactor SyslogSink to take an error handler instead of error channel
2ae20fb Add gosub-generated package specs and pre-commit hook to sync specs
ecf7bb0 Bump dropsonde