* master: make volume capacity reservation timeout configurable (#11426)
* master: expire reservations on reads, fix int timeout units
- AvailableSpaceForReservation now expires reservations too: a node that
is full of reservations is filtered out before TryReserveCapacity can
clean them, which stranded expired capacity indefinitely.
- Drop TryReserveCapacityWithTimeout: a per-call timeout lets one caller
expire another's live reservations, and the Node interface stays
stable for implementations outside this tree.
- parseReservationTimeout no longer routes integer values through
GetDuration, which read them as nanoseconds; bare numbers are
seconds. The 5m fallback is now the shared DefaultReservationTimeout.
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Co-authored-by: Chris Lu <chrislusf@users.noreply.github.com>
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