Determine enabled disk templates by looking at disks
Determine enabled disk templates by looking at disks

Before this, the enabled disk templates check was done using the
instance disk templates. This patch adds all disks.

Signed-off-by: Aaron Karper <99cc1031546340b2b8ced5fe338b5890677a56ca@google.com>
Reviewed-by: Michele Tartara <05f7077a2c6cbbdc4af4ba42e3ef89a0df846179@google.com>

ganeti/ganeti,yiannist/ganeti,yiannist/ganeti,bitemyapp/ganeti,leshchevds/ganeti,ganeti/ganeti,onponomarev/ganeti,leshchevds/ganeti,mbakke/ganeti,dimara/ganeti,andir/ganeti,andir/ganeti,andir/ganeti,grnet/snf-ganeti,mbakke/ganeti,dimara/ganeti,yiannist/ganeti,grnet/snf-ganeti,bitemyapp/ganeti,onponomarev/ganeti,mbakke/ganeti,ganeti/ganeti,leshchevds/ganeti