vol: Blank opts in VOptDefaults
Instead of needing to set every single field in the 'opts' structure
individually, blank the whole thing to make sure the entire struct is
initialized. Remove the now-redundant lines that initialize various
items to 0.
Change-Id: I799cdb55becd66a8f3d6ec2f81338843038d0abd
Reviewed-on: https://gerrit.openafs.org/14280
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Kailas Zadbuke <kailashsz@in.ibm.com>
Reviewed-by: Yadavendra Yadav <yadayada@in.ibm.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>