add delete shm by shmkey method

chenshijun

2020-03-25 f874c2d74127294f79caeb6185eab02fc517d933

add delete shm by shmkey method

 shmwrap.go

@@ -139,3 +139,13 @@
func RemoveShmID(id int) error {
   return shm.Rm(id)
}

// RemoveShmID Remove shmid
func RemoveShmKey(shmkey int) error {
    _, id, err := AttachBlock(shmkey)
    if err != nil {
        return err
    } else {
        return shm.Rm(id)
    }
}