client: connect to export targets on cap EXPORT
client: connect to export targets on cap EXPORT

Also unconditionally connect on reconnect, even when there aren't any
outstanding requests.

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

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