[19.03] Fix rate limiting for logger, increase refill rate

[cpuguy83]

Backports #39360 to 19.03

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Signed-off-by: Ethan Mosbaugh ethan@replicated.com

- What I did

fixes #38640

- How I did it

The rate limiter will get refilled at a rate of 1 token per second. My understanding of the code it is intended to get refilled at a rate of 10M / second.

moby/vendor/golang.org/x/time/rate/rate.go

Lines 31 to 37 in 39c8e88

	// A Limiter controls how frequently events are allowed to happen.
	// It implements a "token bucket" of size b, initially full and refilled
	// at rate r tokens per second.
	// Informally, in any large enough time interval, the Limiter limits the
	// rate to r tokens per second, with a maximum burst size of b events.
	// As a special case, if r == Inf (the infinite rate), b is ignored.
	// See https://en.wikipedia.org/wiki/Token_bucket for more about token buckets.

- How to verify it

$ docker service create --name lotsologs --restart-condition on-failure -d debian:stretch-slim bash -c "for i in \$(seq 1 60000); do cat /dev/urandom | tr -dc 'a-zA-Z0-9 ' | fold -w 256 | head -n 1; done"
y0uhc0ulyxcqe2r5gehfzeiks

wait a while for the logs to fill up

$ docker service logs lotsologs > tmp # hangs
^C
$ ls -lh tmp
-rw-rw-r-- 1 ethan ethan 12M Jun 12 21:07 tmp

- Description for the changelog

Fixed an issue that caused requests for docker swarm service and task logs to hang indefinitely for logs with size greater than 10 MB.

- A picture of a cute animal (not mandatory but encouraged)

[thaJeztah]

LGTM