MTL-2000 packages.local cname

Adds `packages.local` as a CNAME to `packages.nmn`. This will trump
`statics.conf`, causing `packages.local` to resolve to the PIT nexus
while DNSMasq is running.

This is compatible with the MTL-2000 cloud-init code, this new CNAME
will allow `packages.local` to correctly resolve to PIT nexus during
bootstrap. Then, during the csm install, when DNSMasq is shutdown
`packages.local` will begin resolving to k8s nexus.

pkg/pit/dnsmasq.go

@@ -110,6 +110,7 @@ interface-name=pit.nmn,bond0.nmn0
 domain=nmn,{{.CIDR.IP}},{{.DHCPEnd}},local
 dhcp-option=interface:bond0.nmn0,option:domain-search,nmn
 interface=bond0.nmn0
+cname=packages.local,pit.nmn
 cname=packages.nmn,pit.nmn
 cname=registry.nmn,pit.nmn
 # This needs to point to the liveCD IP for provisioning in bare-metal environments.