Add at least one test that should cause a failed auth

scripts/test_integration_edge.sh

@@ -36,6 +36,7 @@ docmd ${TOPDIR}/scripts/n2n-ctl edges --raw
 #   - uptime
 
 docmd ${TOPDIR}/scripts/n2n-ctl verbose
+docmd ${TOPDIR}/scripts/n2n-ctl --write verbose 1 2>&1
 docmd ${TOPDIR}/scripts/n2n-ctl -k $AUTH --write verbose 1
 
 # looks strange, but we are querying the state of the "stop" verb

tests/test_integration_edge.sh.expected

@@ -41,6 +41,22 @@
     }
 ]
 
+###
+Traceback (most recent call last):
+  File "/home/hamish/r/n2n/./scripts/n2n-ctl", line 258, in <module>
+    main()
+  File "/home/hamish/r/n2n/./scripts/n2n-ctl", line 249, in main
+    result = func(rpc, args)
+  File "/home/hamish/r/n2n/./scripts/n2n-ctl", line 205, in subcmd_default
+    rows = rpc.write(cmdline)
+  File "/home/hamish/r/n2n/./scripts/n2n-ctl", line 106, in write
+    return self._call('w', cmdline)
+  File "/home/hamish/r/n2n/./scripts/n2n-ctl", line 100, in _call
+    return self._rx(tagstr)
+  File "/home/hamish/r/n2n/./scripts/n2n-ctl", line 53, in _rx
+    raise ValueError('Error: {}'.format(data['error']))
+ValueError: Error: badauth
+
 ###
 [
     {