r3328 ios12.connector: also include VLAN table into output

r3328 ios12.connector: also include VLAN table into output
iosReadVLANConfig(): renamed to ios12ReadVLANConfig() for consistency, start with 2-node array
iosPickInterfaceCommand(): renamed to ios12ScanTopLevel(), added VLAN table detection and ifname mapping
getDevice8021QConfig(): adjusted accordingly
renderObjectVLANSync(): don't perform ifname mapping here, use 'portdata' sub-node
iosPickSwitchportCommand(): renamed to ios12PickSwitchportCommand()
ios12PickVLANCommand(): new function
fdry5ReadVLANConfig(): start with 2-node array, perform VLAN list maintenance
fdry5PickVLANSubcommand(): omit condition, which is always met