volumes: be more tolerant and fix infinite loop

Make Podman more tolerant when parsing image volumes during container
creation and further fix an infinite loop when checking them.

Consider `VOLUME ['/etc/foo', '/etc/bar']` in a Containerfile.  While
it looks correct to the human eye, the single quotes are wrong and yield
the two volumes to be `[/etc/foo,` and `/etc/bar]` in Podman and Docker.

When running the container, it'll create a directory `bar]` in `/etc`
and a directory `[` in `/` with two subdirectories `etc/foo,`.  This
behavior is surprising to me but how Docker behaves.  We may improve on
that in the future.  Note that the correct way to syntax for volumes in
a Containerfile is `VOLUME /A /B /C` or `VOLUME ["/A", "/B", "/C"]`;
single quotes are not supported.

This change restores this behavior without breaking container creation
or ending up in an infinite loop.

BZ: https://bugzilla.redhat.com/show_bug.cgi?id=2014149
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

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