add descriptions for DUT ports and refactor BGP configuration functions

[karthikeya-remilla]

adding code which resolves the IPv4 prefixes mismatch.

IPv6 prefix mismatch still needs to be triaged further.

[OpenConfigBot]

Pull Request Functional Test Report for #4784 / ddeda6b4fe45d250e139f278812015f80cb61f31

Virtual Devices

Device	Test	Test Documentation	Job	Raw Log
Arista cEOS		RT-1.15: BGP Addpath on scale with and without routing policy
Cisco 8000E		RT-1.15: BGP Addpath on scale with and without routing policy
Cisco XRd		RT-1.15: BGP Addpath on scale with and without routing policy
Juniper ncPTX		RT-1.15: BGP Addpath on scale with and without routing policy
Nokia SR Linux		RT-1.15: BGP Addpath on scale with and without routing policy
Openconfig Lemming		RT-1.15: BGP Addpath on scale with and without routing policy

Hardware Devices

Device	Test	Test Documentation	Raw Log
Arista 7808		RT-1.15: BGP Addpath on scale with and without routing policy
Cisco 8808		RT-1.15: BGP Addpath on scale with and without routing policy
Juniper PTX10008		RT-1.15: BGP Addpath on scale with and without routing policy
Nokia 7250 IXR-10e		RT-1.15: BGP Addpath on scale with and without routing policy

Help

[coveralls]

Pull Request Test Coverage Report for Build 19145942319

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 11.08%

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Totals
Change from base Build 19138419347:	0.0%
Covered Lines:	2224
Relevant Lines:	20073

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💛 - Coveralls