Update git submodules

* Update docs/submodules/dmaap/datarouter.git from branch 'master'
  to a884c481af24e2405f9389b01842c4671a03a75e
  - Allow storing db.user and db.pass in environment variables

    This patch allows to store and get db.user and db.pass from
    environment variables. This is needed if we want to send those
    variables by helm secrets.

    Issue-ID: OOM-2287
    Signed-off-by: Dominik Mizyn <d.mizyn@samsung.com>
    Change-Id: Ie1736dd4bd89710b441f5cc96dd116bd433ad1b6

diff --git a/docs/submodules/dmaap/datarouter.git b/docs/submodules/dmaap/datarouter.git
index 6ac1c84..a884c48 160000 (submodule)
--- a/docs/submodules/dmaap/datarouter.git
+++ b/docs/submodules/dmaap/datarouter.git
@@ -1 +1 @@
-Subproject commit 6ac1c84f0aeec17dba6c55c7097a264b1a7b6ba2
+Subproject commit a884c481af24e2405f9389b01842c4671a03a75e