BZ #1142483 - osd pool size, journal size params in ceph.conf

https://bugzilla.redhat.com/show_bug.cgi?id=1142483

For POC/dev testing, a value of 1 for osd_pool_default_size and 1000
for osd_journal_size can be useful.
Do these two lines work of the default value of '' is set?