ipam/host-local: support multiple IP ranges

This change allows the host-local allocator to allocate multiple IPs.
This is intended to enable dual-stack, but is not limited to only two
subnets or separate address families.

plugins/ipam/host-local/backend/store.go

@@ -20,8 +20,8 @@ type Store interface {
 	Lock() error
 	Unlock() error
 	Close() error
-	Reserve(id string, ip net.IP) (bool, error)
-	LastReservedIP() (net.IP, error)
+	Reserve(id string, ip net.IP, rangeID string) (bool, error)
+	LastReservedIP(rangeID string) (net.IP, error)
 	Release(ip net.IP) error
 	ReleaseByID(id string) error
 }