tests: add a test for restoring a resource out of drbdsetup show

This demonstrates the effectiveness of the previous commit.

Author: Philipp-Reisner

tests/v9/restore_show.res

@@ -0,0 +1,30 @@
+resource "lb-tcp-20251117-171820" {
+    _this_host {
+        node-id                 0;
+        volume 0 {
+            device                      minor 1;
+            disk                        "/dev/scratch/lb-tcp-20251117-171820-disk0";
+            meta-disk                   internal;
+            disk {
+                disk-flushes            no;
+                md-flushes              no;
+            }
+        }
+    }
+    connection {
+        _peer_node_id 1;
+        path {
+            _this_host ipv4 192.168.122.35:7789;
+            _remote_host ipv4 192.168.122.36:7789;
+        }
+        path {
+            _this_host ipv4 10.255.0.254:7789;
+            _remote_host ipv4 10.255.0.162:7789;
+        }
+        _cstate Connecting;
+        net {
+            load-balance-paths  yes;
+            _name               "f43-2";
+        }
+    }
+}

tests/v9/restore_show.test

@@ -0,0 +1,10 @@
+$ ./drbdadm -c ./restore_show.res -d up all 2>/dev/null
+drbdsetup new-resource lb-tcp-20251117-171820 0
+drbdsetup new-minor lb-tcp-20251117-171820 1 0
+drbdsetup new-peer lb-tcp-20251117-171820 1 --load-balance-paths=yes --_name=f43-2
+drbdsetup new-path lb-tcp-20251117-171820 1 ipv4:192.168.122.35:7789 ipv4:192.168.122.36:7789
+drbdsetup new-path lb-tcp-20251117-171820 1 ipv4:10.255.0.254:7789 ipv4:10.255.0.162:7789
+drbdmeta 1 v09 /dev/scratch/lb-tcp-20251117-171820-disk0 internal repair-md
+drbdmeta 1 v09 /dev/scratch/lb-tcp-20251117-171820-disk0 internal apply-al
+drbdsetup attach 1 /dev/scratch/lb-tcp-20251117-171820-disk0 /dev/scratch/lb-tcp-20251117-171820-disk0 internal --disk-flushes=no --md-flushes=no
+drbdsetup connect lb-tcp-20251117-171820 1