testsuite: depmod: check netsted loops reporting

The patch adds nested loops configuration for the loop test:

mod-loop-h -> mod-loop-i -> mod-loop-j -> mod-loop-k
   ^                           |               |
    ---------------------------                |
   |                                           |
    -------------------------------------------

making 2 loops with common edges:

mod-loop-h -> mod-loop-i -> mod-loop-j -> mod-loop-h
mod-loop-h -> mod-loop-i -> mod-loop-j -> mod-loop-k -> mod-loop-h

The actual output for the loops is:

depmod: ERROR: Cycle detected: mod_loop_h -> mod_loop_h
depmod: ERROR: Cycle detected: mod_loop_i -> mod_loop_j -> mod_loop_k -> mod_loop_h -> mod_loop_i

(the order in the second doesn't matter, but the first one is
incorrect)

Signed-off-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
diff --git a/testsuite/rootfs-pristine/test-depmod/detect-loop/correct.txt b/testsuite/rootfs-pristine/test-depmod/detect-loop/correct.txt
index 01ecb89..ff28545 100644
--- a/testsuite/rootfs-pristine/test-depmod/detect-loop/correct.txt
+++ b/testsuite/rootfs-pristine/test-depmod/detect-loop/correct.txt
@@ -1,3 +1,5 @@
 depmod: ERROR: Cycle detected: mod_loop_d -> mod_loop_e -> mod_loop_d
-depmod: ERROR: Cycle detected: mod_loop_b -> mod_loop_c -> mod_loop_a -> mod_loop_b
-depmod: ERROR: Found 5 modules in dependency cycles!
+depmod: ERROR: Cycle detected: mod_loop_i -> mod_loop_j -> mod_loop_k -> mod_loop_h -> mod_loop_i
+depmod: ERROR: Cycle detected: mod_loop_i -> mod_loop_j -> mod_loop_h -> mod_loop_i
+depmod: ERROR: Cycle detected: mod_loop_c -> mod_loop_a -> mod_loop_b -> mod_loop_c
+depmod: ERROR: Found 9 modules in dependency cycles!