[bug] pull images failure impacts pouch images

[Letty5411]

Ⅰ. Issue Description

Pull image failure makes pouch images doesn't work:

[[email protected] /root]
#pouch pull registry.hub.docker.com/library/httpd:latest
registry.hub.docker.com/library/httpd:latest:                                  resolved       |++++++++++++++++++++++++++++++++++++++|
index-sha256:bd13a0fc2aa205653032b3fef7895332bbbbc6fc9b0552e42d4b33b4a5481290: done           |++++++++++++++++++++++++++++++++++++++|
elapsed: 4.7 s                                                                 total:  1.1 Ki (229.0 B/s)
Error: failed to display progress: failed to pull image: manifest sha256:bd13a0fc2aa205653032b3fef7895332bbbbc6fc9b0552e42d4b33b4a5481290: not found

[[email protected] /root]
#pouch images
Error: failed to get image list: {"message":"manifest sha256:bd13a0fc2aa205653032b3fef7895332bbbbc6fc9b0552e42d4b33b4a5481290: not found"}

Using Containerd list image is OK:

root@osboxes:pouch (master) -> ctr --address /var/run/containerd.sock images ls
REF                                                TYPE                                                      DIGEST                                                                  SIZE      PLATFORMS                                                                                              LABELS
registry.hub.docker.com/library/busybox:latest     application/vnd.docker.distribution.manifest.list.v2+json sha256:2107a35b58593c58ec5f4e8f2c4a70d195321078aebfadfbfb223a2ff4a4ed21 710.8 KiB linux/386,linux/amd64,linux/arm/v5,linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/ppc64le,linux/s390x  -
registry.hub.docker.com/library/hello-world:latest application/vnd.docker.distribution.manifest.list.v2+json sha256:97ce6fa4b6cdc0790cda65fe7290b74cfebd9fa0c9b8c38e979330d547d22ce1 6.0 KiB   linux/386,linux/amd64,linux/arm/v5,linux/arm/v7,linux/arm64/v8,linux/ppc64le,linux/s390x,windows/amd64 -
registry.hub.docker.com/library/httpd:latest       application/vnd.docker.distribution.manifest.list.v2+json sha256:bd13a0fc2aa205653032b3fef7895332bbbbc6fc9b0552e42d4b33b4a5481290 1.1 KiB   linux/arm/v5,linux/ppc64le,linux/s390x                                                                 -
registry.hub.docker.com/library/ubuntu:14.04       application/vnd.docker.distribution.manifest.list.v2+json sha256:ed49036f63459d6e5ed6c0f238f5e94c3a0c70d24727c793c48fded60f70aa96 69.7 MiB  linux/386,linux/amd64,linux/arm/v7,linux/arm64/v8,linux/ppc64le                                        -
root@osboxes:pouch (master) -> pouch images
Error: failed to get image list: {"message":"manifest sha256:bd13a0fc2aa205653032b3fef7895332bbbbc6fc9b0552e42d4b33b4a5481290: not found"}

Ⅱ. Describe what happened

Ⅲ. Describe what you expected to happen

Ⅳ. How to reproduce it (as minimally and precisely as possible)

Ⅴ. Anything else we need to know?

Ⅵ. Environment:

• pouch version (use pouch version):
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: