ASM-2677 non-alphanumeric characters ("-") failed set vlan into FTOS switch by ASM

MXL VLAN resource has an argument validation not allowing the non-alpha numeric characters in the vlan name
This validation is not required for any FTOS devices. This validation got carried forward from Cisco validation list
The validation is removed from the resource
Merge pull request #20 from sushilrai/vlan_name_validation

ASM-2677 non-alphanumeric characters ("-") failed set vlan into FTOS switch by ASM