[ixpmanager] IXP manager can't accept option for MRTG ?

[Basil Elbalaawi]

>
> Hi Nick
>

after disable  GRAPHER_BACKEND_MRTG_DBTYPE="rrd"
by  #GRAPHER_BACKEND_MRTG_DBTYPE="rrd"

the output of graph is

file_put_contents(/srv/ixpmanager/storage/framework/cache/data/c2/6e/c26ee835b3e3e0176e686264d2c08452c0b8162a):
failed to open stream: Permission denied

????
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