ceph/ceph — pull request #1900 by dachary (2014-05-31 11:13:59+00:00)
Title: common: s/stringstream/ostream/ in str_map

There is no need to specialize more than ostream : it only makes it
impossible to use cerr or cout as a parameter to str_map.

Reviewed-By: Christophe Courtaut
Signed-off-by: Loic Dachary