gce/ex_create_address: Test two error cases
gce/ex_create_address: Test two error cases

ByteInternet/libcloud,mistio/libcloud,apache/libcloud,ByteInternet/libcloud,StackPointCloud/libcloud,Kami/libcloud,mistio/libcloud,Kami/libcloud,vongazman/libcloud,Scalr/libcloud,ByteInternet/libcloud,vongazman/libcloud,apache/libcloud,Kami/libcloud,vongazman/libcloud,andrewsomething/libcloud,andrewsomething/libcloud,mistio/libcloud,andrewsomething/libcloud,StackPointCloud/libcloud,StackPointCloud/libcloud,apache/libcloud,Scalr/libcloud,Scalr/libcloud