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when isc_nm_destroy() is called, there's a loop that waits for other references to be detached, pausing and unpausing the netmgr to ensure that all the workers' events are run, followed by a 1-second sleep. this caused a delay on shutdown which will be noticeable when netmgr is used in tools other than named itself, so the delay has now been reduced to a hundredth of a second. (cherry picked from commit 870204fe)
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