zfs-module-parameters(5): add all missing items

I ran a report against the output of modinfo zfs.ko. This commit adds
everything missing and corrects a few renamed module parameters.
Specifically:

• zfs_checksums_per second renamed in ad796b8a3
• vdev_ms_count_limit renamed in c853f382d

Also fixes some variable type inconsistencies (unsigned int => uint)

Reviewed-by: George Amanakis <gamanakis@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: DHE <git@dehacked.net>
Closes #9809