kclient: fix add_cap cap update
kclient: fix add_cap cap update

We want to _set_ cap->issued, and add bits to cap->implemented.  This
mirrors what we see in handle_cap_grant.  Note that this is dependent
on that fact that (currently, at least!) we should never see
a revocation here.

ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph,ajnelson/ceph