ios parsing error for vlan ranges

[TestingBytes]

If an ios config contains a range of vlans a parsing error is observed.

Example config:

vlan 60
name VLAN_A
!
vlan 64-65
!
vlan 80
name VLAN_B

Result:

File "/home/.local/lib/python3.7/site-packages/ntc_rosetta/parsers/openconfig/ios/openconfig_vlan/vlans.py", line 44, in vlan_id
return int(self.yy.key)
ValueError: invalid literal for int() with base 10: '64-65'