Update Bazel container version to 0.17.2. (#192)

diff --git a/.bazelci/presubmit.yml b/.bazelci/presubmit.yml
index 499b27d..5b43590 100644
--- a/.bazelci/presubmit.yml
+++ b/.bazelci/presubmit.yml
@@ -28,10 +28,10 @@
     - "//container/debian8/builders/rbe-debian8:toolchain-test"
     - "//container/ubuntu16_04/builders/rbe-ubuntu16_04:toolchain-test"
     - "//container/experimental/rbe-debian9:toolchain-test"
-    - "//container/ubuntu16_04/builders/bazel:bazel_0.17.1-test"
-    - "//container/ubuntu16_04/builders/bazel_docker_gcloud:bazel_0.17.1_docker_gcloud-test"
-    - "//container/debian8/builders/bazel:bazel_0.17.1-test"
-    - "//container/ubuntu14_04/builders/bazel:bazel_0.17.1-test"
+    - "//container/ubuntu16_04/builders/bazel:bazel_0.17.2-test"
+    - "//container/ubuntu16_04/builders/bazel_docker_gcloud:bazel_0.17.2_docker_gcloud-test"
+    - "//container/debian8/builders/bazel:bazel_0.17.2-test"
+    - "//container/ubuntu14_04/builders/bazel:bazel_0.17.2-test"
     test_flags:
     - "--test_output=errors"
     - "--verbose_failures"
diff --git a/container/build.py b/container/build.py
index ae08d9f..8435b36 100644
--- a/container/build.py
+++ b/container/build.py
@@ -80,7 +80,7 @@
 import subprocess
 import sys
 
-LATEST_BAZEL_VERSION = "0.17.1"
+LATEST_BAZEL_VERSION = "0.17.2"
 
 SUPPORTED_TYPES = [
     "rbe-debian8", "rbe-debian9", "rbe-ubuntu16_04", "ubuntu16_04-bazel",
diff --git a/container/common/bazel/version.bzl b/container/common/bazel/version.bzl
index c874d95..1744ab3 100644
--- a/container/common/bazel/version.bzl
+++ b/container/common/bazel/version.bzl
@@ -4,4 +4,5 @@
     "0.15.2": "13eae0f09565cf17fc1c9ce1053b9eac14c11e726a2215a79ebaf5bdbf435241",
     "0.16.1": "17ab70344645359fd4178002f367885e9019ae7507c9c1ade8220f3628383444",
     "0.17.1": "feedbe02c81142ed95ef8d380472f0a0d88e1b9a4b1fb6e21728701032b68e02",
+    "0.17.2": "31fac8b2edcc6d95f1afb21725f604479eb440596e7fc7554fd47e293020ced9",
 }