[6348] ceph-deploy should use same option seperator

define subclass for Ceph config files.
make new.new and conf.load use new CephConf
add test case for config writing.

Signed-off-by: Andrew Woodward (awoodward@mirantis.com)
Merge pull request #90 from xarses/6348

[6348] ceph-deploy should use same option seperator