Pin awscli to latest (#270)

Author: saimidu

docker/1.15.0/py3/Dockerfile.cpu

@@ -112,7 +112,7 @@ RUN pip install --no-cache-dir -U \
     horovod==0.18.2 \
  && pip install --no-cache-dir -U \
     $FRAMEWORK_SUPPORT_INSTALLABLE \
-    awscli==1.16.314 \
+    awscli==1.17.1 \
  && rm -f $FRAMEWORK_SUPPORT_INSTALLABLE
 
 COPY dockerd-entrypoint.py /usr/local/bin/dockerd-entrypoint.py

docker/1.15.0/py3/Dockerfile.gpu

@@ -147,7 +147,7 @@ RUN pip install --no-cache-dir -U \
     ${TF_URL} \
  && pip install --no-cache-dir -U \
     $FRAMEWORK_SUPPORT_INSTALLABLE \
-    awscli==1.16.314 \
+    awscli==1.17.1 \
  && rm -f $FRAMEWORK_SUPPORT_INSTALLABLE
 
 # Install Horovod, temporarily using CUDA stubs