Update git submodules

Update git submodules

* Update docs/submodules/oom.git from branch 'elalto'
  to 6e87f754c04c8c7b1c7ecc6ecc57eb51397bd6d4
  - docs: Ensure literalinclude directive rendering

    Literalinclude directive is not rendered as such unless separated from
    the surrounding paragraphs by blank lines (like all paragraphs) [1].

    [1] http://docutils.sourceforge.net/docs/ref/rst/restructuredtext.html#literal-blocks

    Issue-ID: OOM-1612
    Change-Id: I51e7f8f2f99dfe157b24fe7c5ae4d62281d72e86
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>
  - docs: Replace include directives for non existent file

    This patch resolves issue with including non existent file in OOM
    documentation. Included file has been removed in [1] and seems to be
    replaced by "kubernetes/onap/values.yaml" from [2] (91% similarity [3]).

    [1] ed5ff714fac29651318868a65267030e3c31c3ee (Change-Id: Ia51db5f1489e8d63fd7e1f10e80174eb9f182f0f)
    [2] ac281bd0798ae7308402f4d19d537546d101afba (Change-Id: I4b74a3a8a35a178298af7205762e2aca7c65dda3)
    [3] Similarity measured with:

    $ git checkout ed5ff714^
    $ wdiff --no-deleted --no-inserted --no-common --statistics \
      kubernetes/onap/values.yaml docs/onap_values.yaml

    Issue-ID: OOM-2203
    Change-Id: I9634797c75f4da4652194f72190b21e30c4feb21
    Signed-off-by: Pawel Wieczorek <p.wieczorek2@samsung.com>