Matt Kulka 3168a722ca Use cancelable contexts for cloud provider plugin refreshes (#4226) ...

This commit uses a cancelable context to spawn goroutines that refresh
records from a cloud DNS provider. The Caddy shutdown routine uses the
returned cancel function to terminate existing goroutines when a USR1
reload signal is received.

Signed-off-by: Matt Kulka <mkulka@parchment.com>

2020-10-24 14:37:01 +02:00

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