Update git submodules

Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fixes Ceph PG calculation"
  - Fixes Ceph PG calculation

    Baremetal deployments were failing because the ceph PG size was
    exceeding the max allowed. Virtual was still working because we lower
    the number of pools and pg/osd. This patch changes the values to a
    number which should work for both virtual and baremetal. Also includes a
    fix which adds the controllers back as OSDs and a few other cleanup
    issues.

    JIRA: APEX-614
    JIRA: APEX-569

    Change-Id: I2ad65727ecdcaa0454eb53d25e32b7f1a53cd3a4
    Signed-off-by: Tim Rozet <trozet@redhat.com>