Don't delete actual LRP in bbs.ResolveStopLRPInstance

Signed-off-by: Ted Young <tyoung@pivotallabs.com>
generalise DesiredLRP, embed in LRPStartAuction

this also removes index from logconfig, which will break things. this allows
it to be all configurable in the desiredlrp.

Signed-off-by: Simon Leung <leungs@us.ibm.com>