Merge remote-tracking branch 'illumos-ml/master' into titanic

Some zev merge conflicts fixed.

Conflicts:
usr/src/uts/common/fs/zfs/zfs_ioctl.c
usr/src/uts/common/fs/zfs/zvol.c

3830 SIGQUEUE_MAX's limit of 32 is too low
Reviewed by: Cedric Blancher <cedric.blancher@gmail.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Irek Szczesniak <iszczesniak@gmai

3830 SIGQUEUE_MAX's limit of 32 is too low
Reviewed by: Cedric Blancher <cedric.blancher@gmail.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Irek Szczesniak <iszczesniak@gmail.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

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