Add zfs_disable_dup_eviction module option

Commit 1eb5bfa introduced a new zfs_disable_dup_eviction tunable.
It should have been made available as a module option in the
original patch but was overlooked.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Add zfs_arc_memory_throttle_disable module option

The way in which virtual box ab(uses) memory can throw off the
free memory calculation in arc_memory_throttle().  The result is
the txg_sync thread will effectively spin waiting for memory to
be released even though there's lots of memory on the system.

To handle this case I'm adding a zfs_arc_memory_throttle_disable
module option largely for virtual box users.  Setting this option
disables free memory checks which allows the txg_sync thread to
make progress.

By default this option is disabled to preserve the current
behavior.  However, because Linux supports direct memory reclaim
it's doubtful throttling due to perceived memory pressure is ever
a good idea.  We should enable this option by default once we've
done enough real world testing to convince ourselve there aren't
any unexpected side effects.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #938
ZFS 0.6.0-rc14
merge rc14