[LIBCLOUD-870] create_balancer & ex_create_balancer methods for ALB driver
[LIBCLOUD-870] create_balancer & ex_create_balancer methods for ALB driver

apache/libcloud,Kami/libcloud,apache/libcloud,apache/libcloud,mistio/libcloud,mistio/libcloud,ByteInternet/libcloud,Kami/libcloud,ByteInternet/libcloud,Kami/libcloud,andrewsomething/libcloud,ByteInternet/libcloud,mistio/libcloud,andrewsomething/libcloud,andrewsomething/libcloud