The configuration that we are using by default that sets pg_num and pgp_num values in bootstrap_ceph breaks devstack-plugin-ceph when using the latest Ceph version (quincy). This patch sets removes the config for pg_num and pgp_num, so we delegate to Ceph the pools autoscaling. Closes-Bug: #1983107 Change-Id: Iecd949ef2258ae8a6ded596219bb993aeff20de5