Change the isc_nm_(get|set)timeouts() to work with milliseconds
The RFC7828 specifies the keepalive interval to be 16-bit, specified in units of 100 milliseconds and the configuration options tcp-*-timeouts are following the suit. The units of 100 milliseconds are very unintuitive and while we can't change the configuration and presentation format, we should not follow this weird unit in the API. This commit changes the isc_nm_(get|set)timeouts() functions to work with milliseconds and convert the values to milliseconds before passing them to the function, not just internally.
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