Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Enhance variable manipulation in rally"
  - Enhance variable manipulation in rally

    - utilize env vars directly via os module
    - use getattr to read CONST

    JIRA: FUNCTEST-931

    Change-Id: I893a91331e26846f8effe2d3d58522950bd096fd
    Signed-off-by: Juha Kosonen <juha.kosonen@nokia.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 0e3418f..14b025c 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 0e3418f0bb71d9364268857c8f4431433d5d54f6
+Subproject commit 14b025cc9ca739957553d3fede7803be78a1a2cf