ceph.conf: mon reweight min pgs per osd = 4
ceph.conf: mon reweight min pgs per osd = 4

So teh cephtool reweight-by-pg test will pass with mini clusters.

Signed-off-by: Sage Weil <6dd34506bbd5e58221bbb3e4732d97c91f02277b@redhat.com>

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