fstests: rename _test_inject_logprint to _test_remount_dump_log
Rename _test_inject_logprint to _test_remount_dump_log to better
describe what this function does. _test_remount_dump_log unmounts
and remounts the test device, dumping the log.
Signed-off-by: Catherine Hoang <catherine.hoang@oracle.com> Reviewed-by: Allison Henderson <allison.henderson@oracle.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Eryu Guan <guaneryu@gmail.com>