gen_topo.sh: Use /var/tmp/gen_topo as gen_topo temp folder

[davidrohr]

@martenole : Could we deploy this with the next software update?

It moves the gen_topo temp folder to a local folder on the infra node.
Not sure if you'll need to adapt any of your fetch/check scripts.

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[martenole]

Looks good, I will include a new GenTopo for the next sw update. The log fetcher only queries /var/log/topology/gen-topo.log, so I don't have to change anything there

[davidrohr]

@martenole : I think this was not yet deployed at P2? Will you check, or shall I follow up with Christian?

[martenole]

Ah, I think I have missed this, sorry. Will check today