cauthtool: add simpler '--cap key val' syntax
cauthtool: add simpler '--cap key val' syntax

This lets you avoid creating a temp filename and doing '--caps filename'.
Instead, add each cap individually, like

	--cap mon 'allow *' --cap mds 'allow' --cap osd 'allow rwx'

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@newdream.net>

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