Introduce CELLSV2_SETUP variable

Some environments, like grenade and ironic, need a way to revert to
the non fleet version of the conductor setup. This really comes down
to a global topology for CELLSV2_SETUP. The prefered is with a
superconductor, but allow a downgrade to singleconductor.

Depends-On: I5390ec14c41da0237c898852935aba3569e7acae

Change-Id: I10fb048ef2175909019461e585d117b4284448c6
2 files changed