Merge pull request #17483 from srini100/v1.17.x

bump to v1.17.1
diff --git a/requirements.bazel.txt b/requirements.bazel.txt
index 61e529a..7794aec 100644
--- a/requirements.bazel.txt
+++ b/requirements.bazel.txt
@@ -9,7 +9,7 @@
 google-auth>=1.0.0
 oauth2client==4.1.0
 requests>=2.14.2
-urllib3==1.22
+urllib3>=1.23
 chardet==3.0.4
 certifi==2017.4.17
 idna==2.7