common: fix non-daemon init

In commit 4f403c26dc0048ad63e20d20369fa86bfb31c50e we broke the general
non-daemon case.

Also make a note in the release notes.

Signed-off-by: Sage Weil <sage@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
test_ceph_argparse: fix mds {add,remove}_data_pool tests

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

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