mon: MDSMonitor: let PaxosService decide on whether to propose

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
mon: Have 'ceph report' print last committed versions

Only for those services that weren't doing it.

Backport: dumpling
Backport: emperor

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
tools: ceph-kvstore-tool: output value contents to file on 'get'

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>
mon: ceph-kvstore-tool: get size of value for prefix/key

Signed-off-by: Joao Eduardo Luis <joao.luis@inktank.com>