tests/test_nodes.vty: check less libosmocore cmds

Use three dots to avoid checking for exact commands between help and
exit, which originate from libosmocore. This avoids test failues when
we slightly change the commands, like the change from "write file" to
"write file [PATH]" in [1] that is currently causing the vty tests to
fail.

[1] libosmocore I38edcf902a08b6bd0ebb9aa6fc1a7041421af525
Change-Id: I4a964b86195141e5a50705425206f3602f908999
diff --git a/tests/test_nodes.vty b/tests/test_nodes.vty
index bf2afaf..2be9617 100644
--- a/tests/test_nodes.vty
+++ b/tests/test_nodes.vty
@@ -27,12 +27,7 @@
 OsmoHLR> enable
 OsmoHLR# list
   help
-  list
-  write terminal
-  write file
-  write memory
-  write
-  show running-config
+...
   exit
   disable
   configure terminal
@@ -52,12 +47,7 @@
 OsmoHLR# configure terminal
 OsmoHLR(config)# list
   help
-  list
-  write terminal
-  write file
-  write memory
-  write
-  show running-config
+...
   exit
   end
 ...
@@ -66,12 +56,7 @@
 OsmoHLR(config)# hlr
 OsmoHLR(config-hlr)# list
   help
-  list
-  write terminal
-  write file
-  write memory
-  write
-  show running-config
+...
   exit
   end
   gsup
@@ -92,12 +77,7 @@
 OsmoHLR(config-hlr)# gsup
 OsmoHLR(config-hlr-gsup)# list
   help
-  list
-  write terminal
-  write file
-  write memory
-  write
-  show running-config
+...
   exit
   end
   bind ip A.B.C.D