adding service vlan range

[lmarinve]

services is a dictionary with the following supported keys: "l2vpn-ptp" and "l2vpn-ptmp". Each key is another dictionary with the subkey "vlan_range".
services is a dictionary that, when empty, is treated as having the key "l2vpn-ptp" and subkey "vlan_range" with values from 1 to 4095.
The "vlan_range" key under "l2vpn-ptp" and "l2vpn-ptmp" is a comma-delimited list of tuples, where each tuple's element 0 is the first VLAN ID of the range and the tuple's element 1 is the last VLAN ID of the range. Multiple tuples can be provided in any sequence. The minimum VLAN ID supported is 1 and the maximum VLAN ID supported is 4095.