test/lvol: unlink aio files at start of test

This automatically cleans up aio files left over from earlier aborted
runs. This helps streamline development of new tests and should have no
impact on CI.

Signed-off-by: Mike Gerdts <mgerdts@nvidia.com>
Change-Id: Id65f60cdfc9969fda1dcdd17e60643ad87f45de7
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/17898
Reviewed-by: Aleksey Marchuk <alexeymar@nvidia.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>

test/lvol/esnap/esnap.c

@@ -49,6 +49,7 @@ make_test_file(size_t size, char *path, size_t len, const char *name)
 	if (snprintf(path, len, "%s/%s", g_testdir, name) >= (int)len) {
 		return -ENAMETOOLONG;
 	}
+	unlink(path);
 	fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0600);
 	if (fd < 0) {
 		return -errno;