Update git submodules

* Update docs/submodules/functest from branch 'master'
  - Merge "Allow reading log file with byte offset"
  - Allow reading log file with byte offset

    Change-Id: I8cd6acef66d798fa43e20ca9d885dcbaa99a5b42
    Signed-off-by: Linda Wang <wangwulin@huawei.com>

diff --git a/docs/submodules/functest b/docs/submodules/functest
index 0e491ad..42c9977 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit 0e491adc1b1a1fc16db22c160e08b16d19cae45a
+Subproject commit 42c99773c40f669b18c489a8f8b1c9bbb79d51d9