volser: Add -config and -logfile options

Add options to specify alternate locations for the configuration
files and the log file.  This will be helpful for testing.

Change-Id: I4169bc1944719773155931860c6a6dd2fd672f53
Reviewed-on: http://gerrit.openafs.org/9828
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
salvaged: Clean up command line parsing

Clean up the command line parsing in the salvage daemon by making
better use of the cmd library and avoiding hard coded offsets.

Change-Id: Ia300840cfdbb5e03173936148c183ac391e11454
Reviewed-on: http://gerrit.openafs.org/9829
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>