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>
add a trailing slash to file server getter default

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