Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Use metadata IP instead of FQDN

    There is an issue with loss of external network connectivity that
    prevents cloud init to instances working. This becomes a big problem
    with snapshots where there is no external network connectivity. Cloud
    init fails because each request takes over 30 seconds to get a response.
    This is because in the background neutron metadata agent is proxying the
    request to nova metadata agent with an HTTP GET using the FQDN. For
    whatever reason, a DNS lookup happens even though the entry exists for
    the FQDN in /etc/hosts and waits 30 seconds until timing out. After this
    timeout, a 200 OK is sent and metadata works.

    This patch modifies the config file for metadata to use nova metadata
    server's internal IP rather than FQDN as there is no option in OOO to
    use IPs instead of FQDN.

    Change-Id: I6960181a227d0002c99aeae5112f59807dc41d7a
    Signed-off-by: Tim Rozet <trozet@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index 03d3f7b..fb2878c 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit 03d3f7b385c809bc4c7e69619dbdc0e7ed830bd6
+Subproject commit fb2878c414eeb144de72e8204d0988236a684122