Revert "TUN-6007: Implement new edge discovery algorithm"

This reverts commit 4f468b8a5d.

edgediscovery/allregions/address.go

@@ -1,64 +0,0 @@
-package allregions
-
-// Region contains cloudflared edge addresses. The edge is partitioned into several regions for
-// redundancy purposes.
-type AddrSet map[*EdgeAddr]UsedBy
-
-// AddrUsedBy finds the address used by the given connection in this region.
-// Returns nil if the connection isn't using any IP.
-func (a AddrSet) AddrUsedBy(connID int) *EdgeAddr {
-	for addr, used := range a {
-		if used.Used && used.ConnID == connID {
-			return addr
-		}
-	}
-	return nil
-}
-
-// AvailableAddrs counts how many unused addresses this region contains.
-func (a AddrSet) AvailableAddrs() int {
-	n := 0
-	for _, usedby := range a {
-		if !usedby.Used {
-			n++
-		}
-	}
-	return n
-}
-
-// GetUnusedIP returns a random unused address in this region.
-// Returns nil if all addresses are in use.
-func (a AddrSet) GetUnusedIP(excluding *EdgeAddr) *EdgeAddr {
-	for addr, usedby := range a {
-		if !usedby.Used && addr != excluding {
-			return addr
-		}
-	}
-	return nil
-}
-
-// Use the address, assigning it to a proxy connection.
-func (a AddrSet) Use(addr *EdgeAddr, connID int) {
-	if addr == nil {
-		return
-	}
-	a[addr] = InUse(connID)
-}
-
-// GetAnyAddress returns an arbitrary address from the region.
-func (a AddrSet) GetAnyAddress() *EdgeAddr {
-	for addr := range a {
-		return addr
-	}
-	return nil
-}
-
-// GiveBack the address, ensuring it is no longer assigned to an IP.
-// Returns true if the address is in this region.
-func (a AddrSet) GiveBack(addr *EdgeAddr) (ok bool) {
-	if _, ok := a[addr]; !ok {
-		return false
-	}
-	a[addr] = Unused()
-	return true
-}