vps-download: accept relative template cache paths

Current vzctl assumes a template name to be a file name,
not a relative path like contrib/altlinux-p6-20120321-i586;
while TEMPLATE_REPOS can be used to tackle this, looks like
vzctl being able to handle dir/file might be more useful for
maintaining structured template cache collections (provided
that dist.c is able to recognize these by file then by dir).
1 file changed