Downgrade chromedriver to 2.27

Change-Id: I51c547baae23f8cf89652d1554c63df759190ac7
Issue-ID: INT-212
Signed-off-by: Gary Wu <gary.i.wu@huawei.com>
diff --git a/test/csit/run-csit.sh b/test/csit/run-csit.sh
index f499d8e..3070239 100755
--- a/test/csit/run-csit.sh
+++ b/test/csit/run-csit.sh
@@ -105,7 +105,7 @@
 # install chrome driver
 if [ ! -x ${ROBOT_VENV}/bin/chromedriver ]; then
     pushd ${ROBOT_VENV}/bin
-    wget -N http://chromedriver.storage.googleapis.com/2.32/chromedriver_linux64.zip
+    wget -N http://chromedriver.storage.googleapis.com/2.27/chromedriver_linux64.zip
     unzip chromedriver_linux64.zip
     chmod +x chromedriver
     popd