nuke: whitespace

Signed-off-by: Sage Weil <sage@inktank.com>
nuke: dpkg --configure -a and apt-get -f install

Installing debs means we are more likely to hit a case where we interrupt
apt/dpkg.  Try to mop up as best we can in nuke.

Signed-off-by: Sage Weil <sage@inktank.com>
ceph: put client keyrings in /etc/ceph/ceph.$name.keyring

And make it world readable, for ubuntu's sake.

Signed-off-by: Sage Weil <sage@inktank.com>