Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Allow defining CI_LOOP via env

    CI_LOOP is more human-readable than BUILD_TAG and could be set by env.
    Weekly is still the default value even if it can be considered than
    daily is more relevant.

    Change-Id: Ia8e370fe0f967ba2c83d0212f8e045d815b4ddb3
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 5866593..f48fce8 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 58665932c2c910cedac2a135e5b84a5ec4b5946e
+Subproject commit f48fce82d15a274d6fe1a8214f35b48d08a7d9dd