Description of problem:
Using RHCS 3.2z2 and ceph-ansible to deploy multisite, the pools on site2
are created using default pg_num values. This can result in very poor performance.

The pg_num values on site2 should inherit the pg_num value from the existing
pools on site1 

Version-Release number of selected component (if applicable):
ceph-ansible.noarch      3.2.15-1.el7cp

How reproducible:
Always

Steps to Reproduce:
1. deploy site1
2. create pools on site1 with pg_num values as suggested by pg num calc ( https://access.redhat.com/labsinfo/cephpgc )
3. deploy site2
4. edit all.yaml for multisite values
5. run ceph-ansible
6. view pg_num values on site1 and site2

Actual results:
root@f18-h14-000-r620:~
# for i in `rados lspools` ; do echo -ne $i"\t" ; ceph osd pool get $i pg_num ; done
default.rgw.users.keys pg_num: 64
default.rgw.data.root pg_num: 64
.rgw.root pg_num: 64
default.rgw.control pg_num: 64
default.rgw.gc pg_num: 64
default.rgw.buckets.data pg_num: 1024
default.rgw.buckets.index pg_num: 128
default.rgw.buckets.extra pg_num: 64
default.rgw.log pg_num: 64
default.rgw.meta pg_num: 64
default.rgw.intent-log pg_num: 64
default.rgw.usage pg_num: 64
default.rgw.users pg_num: 64
default.rgw.users.email pg_num: 64
default.rgw.users.swift pg_num: 64
default.rgw.users.uid pg_num: 64
site2.rgw.meta pg_num: 8
site2.rgw.log pg_num: 8
site2.rgw.control pg_num: 8
site2.rgw.buckets.index pg_num: 8
site2.rgw.buckets.data pg_num: 8

Expected results:
The pg_num values on site1 default.rgw pools and site2.rgw pools match

Additional info: