Unable to run simulations as root.

[Thecave3]

To run the simulations campaign as root with the new toolchain a flag (--enable-sudo) should be included in the command and at the moment there is no way to do it in sem.

I propose to add this flag in the CampaignManager or to check this at runtime before launching the ./ns3 configure command.

What do you think @pagmatt and others interested?