Switch allocations from KM_SLEEP to KM_PUSHPAGE

A couple of kmem_alloc() allocations were using KM_SLEEP in
the sync thread context.  These were accidentally introduced
by the recent set of Illumos patches.  The solution is to
switch to KM_PUSHPAGE.

dsl_dataset_promote_sync() -> promote_hold() -> snaplist_make() ->
kmem_alloc(sizeof (*snap), KM_SLEEP);

dsl_dataset_user_hold_sync() -> dsl_onexit_hold_cleanup() ->
kmem_alloc(sizeof (*ca), KM_SLEEP)

Signed-off-by: Richard Yao <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Issue #1775

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