make fileserver avoid salvage loop on init failure

make fileserver avoid salvage loop on init failure

if the vlserver or prserver setup can't succeed, it doesn't indicate
a condition which salvaging is required to fix; instead, come up
and retry in the background.

Reviewed-on: http://gerrit.openafs.org/428
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 5b6e5019453952f122523354d0001b04189271a7)
Change-Id: I32d918e8153525998d3c6b9401a6e8b4a24b033b
Reviewed-on: http://gerrit.openafs.org/963