K 10
svn:author
V 7
asomers
K 8
svn:date
V 27
2019-04-28T17:27:06.507494Z
K 7
svn:log
V 359
fsx: seed more randomly with the -S0 option

When using -S0, seed the PRNG with the current time in nanoseconds, not
seconds, so consecutive runs don't accidentally use the same seed.

Also, rename some variables for clarity.

Reviewed by:	ngie
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D20078

END