tarfs_test: split large file test into independent cases

This avoids globally set timeouts for the group of
tarfs_large tests on slower emulated architectures.

While here, lower each testcase's timeout to reflect
the reduction of work. On QEMU aarch64, the largest case
runs in ~500s on a modern desktop, so double that for a
conservative estimate.

Discussed with:		des
MFC after:		3 days
Sponsored by:		The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D59033

0 files changed, 0 insertions, 0 deletions