Steps to reproduce:
```
# docker run -tid --name aaa ubuntu
57bfd00ac5559f72eec8c1b32a01fe38427d66687940f74611e65137414f0ada
# docker run -tid --name bbb --link aaa ubuntu
23ad18362950f39b638206ab4d1885fd4f50cbd1d16aac9cab8e97e0c8363471
# docker ps --no-trunc
CONTAINER ID IMAGE
COMMAND CREATED STATUS PORTS
NAMES
23ad18362950f39b638206ab4d1885fd4f50cbd1d16aac9cab8e97e0c8363471
ubuntu "/bin/bash" 4 seconds ago Up 3 seconds
bbb
57bfd00ac5559f72eec8c1b32a01fe38427d66687940f74611e65137414f0ada
ubuntu "/bin/bash" 14 seconds ago Up 14
seconds aaa,bbb/aaa
# docker rm -f bbb
bbb
# docker ps --no-trunc
CONTAINER ID IMAGE
COMMAND CREATED STATUS PORTS
NAMES
57bfd00ac5559f72eec8c1b32a01fe38427d66687940f74611e65137414f0ada
ubuntu "/bin/bash" 29 seconds ago Up 28
seconds aaa,bbb/aaa
# docker rm --link bbb/aaa
Error response from daemon: Cannot get parent /bbb for name /bbb/aaa
```
When we rm container `bbb`, we can still see `bbb/aaa` in `docker ps
--no-trunc`. And this link cannot be deleted since container `bbb` has
already been removed.
We should remove links of a container when it is deleted.
Signed-off-by: Yuanhong Peng <pengyuanhong@huawei.com>
Upstream-commit: 600ad5c1b7b736fba6b103eb99ec87efb050b9ec
Component: engine
534226435e