[PVE-User] pve2_api.class.php - create vz container - 500 can't find file / can't parse directory

[Dietmar Maurer]

> This API Request Failed.
> HTTP Response - 500
> HTTP Error - HTTP/1.1 500 can't find file '/var/lib/vz/template/cache/debian-
> 6.0-x86_64.tar.gz'

This name does not match our template naming style.

for example, a valid name is: debian-6.0-standard_6.0-4_amd64.tar.gz