Extend orphan-inodes timeout.

This test regularly fails in CI when the 15 seconds elapses and the
system still hasn't concluded the mount log merges and orphan inode
scans needed to unlink the test files.

Instead of just extending the timeout value, we test-and-retry for 120s.
This hopefully is faster in most cases. My smallest VM needs about 6s-8s
on average.

Signed-off-by: Auke Kok <auke.kok@versity.com>

tests/tests/orphan-inodes.sh

@@ -82,7 +82,15 @@ done
 # wait for orphan scans to run
 t_set_all_sysfs_mount_options orphan_scan_delay_ms 1000
 # also have to wait for delayed log merge work from mount
-sleep 15
+C=120
+while (( C-- )); do
+	brk=1
+	for ino in $inos; do
+		inode_exists $ino && brk=0
+	done
+	test $brk -eq 1 && break
+	sleep 1
+done
 for ino in $inos; do
 	inode_exists $ino && echo "$ino still exists"
 done