Update git submodules

* Update docs/submodules/apex from branch 'master'
  - Merge "Increasing loop device size for baremetal deployments"
  - Increasing loop device size for baremetal deployments

    Change-Id: Ib3779733ac27183def6a59f3404cfbe9a3e9a211
    Signed-off-by: Ricardo Noriega <rnoriega@redhat.com>

diff --git a/docs/submodules/apex b/docs/submodules/apex
index a434352..abc1753 160000 (submodule)
--- a/docs/submodules/apex
+++ b/docs/submodules/apex
@@ -1 +1 @@
-Subproject commit a4343527d64cd793643fce8c174f7b4b484fe7d1
+Subproject commit abc17537bc6fd0337e4673fd2bc1fc5c46588097