Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Implement trunk ports - Documentation part"
  - Implement trunk ports - Documentation part

    The tempest testcases have been integrated from Neutron trunk testcases.
    The relevant documentation has been updated.

    JIRA: FUNCTEST-926

    Change-Id: I56cbd0ebb211a283e4e11df28ad6d1520d18e25a
    Signed-off-by: Panagiotis Karalis <pkaralis@intracom-telecom.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 4aa36e5..19f8aad 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 4aa36e5dc403a99098839b5259e60eda67206358
+Subproject commit 19f8aadcf8a08141e9cedc84f4720dcd806355d3