--wait-clean: shorten timeout

--wait-clean: shorten timeout

Set the safemode timeout to a small value to get the array marked clean as
soon as possible.  We don't write 'clean' directly as it may cause mdmon to
miss a 'write-pending' event.

Include a couple fixes to sysfs_set_safemode():
1/ 0 pad the milliseconds field
2/ workaround input truncation in the kernel

Signed-off-by: Dan Williams <dan.j.williams@intel.com>