ressource iosxe_vtp missing attribute to set vtp mode off

[sthoneder]

In resource iosxe_vtp it's not possible to set the vtp mode to off.

Example IOS-XE CLI config

!
vtp mode off
!

The yang model path is that is requested to be added is /native/vtp/ios-vtp:mode/ios-vtp:off

Example solution could be

resource "iosxe_vtp" "example" {
  mode_off = true
}

Device:

• C9200L on 17.15.3

Provider

• iosxe: 0.5.9
• netascode-utils: 0.2.6