Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Update userguide and configguide

    Mainly remove the duplicated declaration of cloudify_ims_perf.

    Change-Id: Ic23cee0e2dbb863cfddc98b08eabdab7d52e0476
    Signed-off-by: Linda Wang <wangwulin@huawei.com>
    (cherry picked from commit e12d4f14b65ba08904a65e188db17992478d67a7)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e7a7c7e..46d8d2e 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e7a7c7ec03880f42411efd9e6703b16930b2372d
+Subproject commit 46d8d2e314a4cc0b394fefc1d4c35f83fe163a57