add network switches at production to dnsmasq

gather mac addresses to PFS-LAN at production, and add them into dnsmasq definitions.

hostnames:

• subaru summit core: swc-infra (.1)
• CB2F: sw1-infra (.2), sw2-infra (.3; jic adding slave one, kyono do you think we don't need to have slave of flexstack?)
• SpS/5th rack: sw1-scr (.4)
• PFI: sw-pfi (.5; fiber to metal media converter with switch)
• Cs: sw-mcs (.6)
• SMs: sw-sm[1-4] (.7-.10)

Also:

• Keep sw2-scr (.11) to be assigned if we place a switch at IR3 (for device connections).
• Keep sw3-infra (.12) to be assigned if we place 10G switch at CB2F