fix some typos in bos_setrestricted

the real name of the command is: 'bos setrestricted'
it is sufficient to name 'bos install' only once

Reviewed-on: http://gerrit.openafs.org/8990
Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit 69f634503482f899e4d422b16100636905c72ea8)

Change-Id: I7ab452cb2cf5e836341f7fc66dacd317cf65ed58
Reviewed-on: http://gerrit.openafs.org/9521
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>