test: shorten sample names, drop numerical prefixes

We don't care about the ordering, so we may just as well drop the numerical
prefixes that we normally use for sorting. Also rename some other samples
to keep width of output down to reasonable width.

test/fuzz/fuzz-netdev-parser/vxlan.netdev

@@ -0,0 +1,16 @@
+[NetDev]
+Name=vxlan99
+Kind=vxlan
+
+[VXLAN]
+Id=999
+L2MissNotification=true
+L3MissNotification=true
+RouteShortCircuit=true
+UDPChecksum=true
+UDP6ZeroChecksumTx=true
+UDP6ZeroChecksumRx=true
+RemoteChecksumTx=true
+RemoteChecksumRx=true
+GroupPolicyExtension=true
+DestinationPort=5555