Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Fixes ceph key import failures"
  - Fixes ceph key import failures
    
    There is an issue with HA deployments where sometimes key imports fail
    for Ceph which seem to occur around 50% of the time.  When logging in
    after a failure, the key import seems to work which indicates it may be
    a race condition.  In addition, sometimes the keyring that is created
    is missing the "caps" section of the file, which will also fail import.
    
    This patch adds a retries for a minute to try to import the key.  It
    also moves creating/importing to the same Exec because there is
    evidence that the file is being modified by some other process right
    after the file content is created in the previous exec.
    
    JIRA: APEX-563
    
    Change-Id: Ie8cfeb4803f6bed95f9e612eeb37c5cdf2d76617
    Signed-off-by: Tim Rozet <trozet@redhat.com>
    

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