[feature] pouch ps supports more filters

[lang710]

Why you need it?

For ps command, I find the currently supported filters are: id, label, name, status. There are some filters, such as exited, network we also need to support.

How it could be?

The exited filter matches containers by exist status code. For example, to filter fo containers that have exited successfully:
$ pouch ps -a --filter 'exited=0'

The network filter shows only containers that are connected to a network with a given name or id.
The following filter matches all containers that are connected to a network with a name containing net1.
$ pouch ps --filter network=net1
The following example use the network id as a filter:
$ pouch ps --filter network=8c0b4110

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