Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Manage criteria in TestCase

    It converts all criteria values to the corresponding percent in
    functest/ci/testcases.yaml.

    Result is expected to be equal or greater than criteria. If both are 0,
    result is considered as false.

    It is compatible with the old behavior but warns to update.
    It will allow a safer remove.

    It also fixes a bug in test_tempest to allow merging [1] and
    tier_handler.py which required that type criteria was str.

    [1] https://gerrit.opnfv.org/gerrit/#/c/27949/

    Change-Id: Ib6edcfa3103b7d51b0bdc83119f1cea2a8be9fbc
    Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index e620488..37c98a6 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit e620488a6747318c40eb973c2607ae6d44e95b8f
+Subproject commit 37c98a6fa101be2b32129dd5d71ad750f5245b88