Fix: Deleting multiple networks stops at first delete fail

[yzxiu]

fixing #1587

 ~ nerdctl network create deleteme --gateway 10.10.11.1 --subnet 10.10.11.0/24
f9d6cec6deabf54691804bb7c1bf02ad7f461ab07f31a18398495b9de1cabf28

 ~ nerdctl network ls                                                         
NETWORK ID      NAME               FILE
                k8s-pod-network    /etc/cni/net.d/10-calico.conflist
17f29b073143    bridge             /etc/cni/net.d/nerdctl-bridge.conflist
f9d6cec6deab    deleteme           /etc/cni/net.d/nerdctl-deleteme.conflist
                host               
                none

 ~ nerdctl network rm host k8s-pod-network test deleteme
Error: pseudo network "host" cannot be removed
Error: k8s-pod-network is managed outside nerdctl and cannot be removed
Error: No such network: test
deleteme

Signed-off-by: yaozhenxiu 946666800@qq.com

[fahedouch]

@yzxiu do you need some help ?

[yzxiu]

@fahedouch thanks, I thought the issue would be fixed here #1581, but it doesn't seem to be.
I seem to have found some bugs, I will submit them.

[yzxiu]

I don't know how to reopen the pr...
new pr #1618