QSG: DAFS uses dasalvager

QSG: DAFS uses dasalvager

For DAFS, you want to use 'dasalvager' not 'salvager'. One place was
still referencing 'salvager' in a DAFS example, so fix it.

Reviewed-on: http://gerrit.openafs.org/3217
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 81602ffa3b6d981ab96ca17d970e585b7be28e6d)
Change-Id: I65f8e7816c8505cc2daddd4d646b65e6062cf686
Reviewed-on: http://gerrit.openafs.org/3224