Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Refactor tempest resource manager"
  - Refactor tempest resource manager

    Split resource creation into several methods.

    Implements partly JIRA: FUNCTEST-913

    Change-Id: Ic0dd5782c604498066c636deef10b0c18c1cb48d
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 89bb802..57539ef 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 89bb80232f777b0619d4168b292338c16a0a704c
+Subproject commit 57539ef2f4633db2a31a27bad5c622f5aaef1ea7