Closes-Bug: #1355592
Issue: per osd pg count set to 32 caused pg set failure
Fix:
    pg count is calculated as follows:
    If host count is greater than 1 then
        ((osd_num * ( host_cnt - 1)) / host_cnt) * osd_num
    If host count is 1 then 12 * osd_num

Change-Id: If8505883372e44cc8832e36c153988c9cb1ab75a
Merge "Closes-Bug: #1355592 Issue: per osd pg count set to 32 caused pg set failure Fix:     pg count is calculated as follows:     If host count is greater than 1 then         ((osd_num * ( host_cnt - 1)) / host_cnt) * osd_num     If host count is 1 then 12 * osd_num"