TUN-1.4: Add Arista deviation

[yini101]

TUN-1.4: Add Arista deviation default_network_instance

[OpenConfigBot]

Pull Request Functional Test Report for #3652 / 13c0eab

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		TUN-1.4: Interface based IPv6 GRE Encapsulation
Cisco 8000E		TUN-1.4: Interface based IPv6 GRE Encapsulation
Cisco XRd		TUN-1.4: Interface based IPv6 GRE Encapsulation
Juniper ncPTX		TUN-1.4: Interface based IPv6 GRE Encapsulation
Nokia SR Linux		TUN-1.4: Interface based IPv6 GRE Encapsulation
Openconfig Lemming		TUN-1.4: Interface based IPv6 GRE Encapsulation

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		TUN-1.4: Interface based IPv6 GRE Encapsulation
Cisco 8808		TUN-1.4: Interface based IPv6 GRE Encapsulation
Juniper PTX10008		TUN-1.4: Interface based IPv6 GRE Encapsulation
Nokia 7250 IXR-10e		TUN-1.4: Interface based IPv6 GRE Encapsulation

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