Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Refactor rally report generation"
  - Refactor rally report generation

    - statistic data based on Rally results report
    - fix statistics calculations
    - use PrettyTable in generating the report

    Change-Id: Ic84adc5e30d446aea1f3045ba997c3ddf895e9f5
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index bbfe9b0..c78fcde 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit bbfe9b09d2b1ac7bfe286311fef83d36c6125c96
+Subproject commit c78fcdeed0ed74661484082801f16c14586b75d4