redhat: don't package kpasswd

While kpasswd was in the separate openafs-kpasswd package to avoid
clashing with the krb5 executable, openafs-debuginfo still conflicted
with krb5-debuginfo.

Don't package kpasswd at all. Package the renamed executable, kapasswd,
in openafs-kpasswd instead of openafs, together with the renamed man
page. Once we're here, provide the man page for the other executable in
there too.

FIXES 131771

Change-Id: I0d7af82072847a19f0e1ce34dbeeb34623d2ef38
Reviewed-on: http://gerrit.openafs.org/10481
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Ken Dreyer <ktdreyer@ktdreyer.com>
Reviewed-by: D Brashear <shadow@your-file-system.com>