Add airflow to base Docker image and license (#1895)

* Adding apache-airflow to the base Docker image

* Add apache-airflow to py3 as well

* Add apache license for airflow

* Fixing text for airflow license

containers/base/Dockerfile

@@ -47,6 +47,7 @@ RUN echo "deb-src http://ftp.us.debian.org/debian testing main" >> /etc/apt/sour
 
 # Setup Python packages. Rebuilding numpy/scipy is expensive so we move this early
 # to reduce the chance that prior steps can cause changes requiring a rebuild.
+    pip install -U --upgrade-strategy only-if-needed --no-cache-dir apache-airflow==1.9.0 && \
     pip install -U --upgrade-strategy only-if-needed --no-cache-dir numpy==1.11.2 && \
     pip install -U --upgrade-strategy only-if-needed --no-cache-dir pandas==0.19.1 && \
     pip install -U --upgrade-strategy only-if-needed --no-cache-dir scipy==0.18.0 && \
@@ -101,6 +102,7 @@ RUN echo "deb-src http://ftp.us.debian.org/debian testing main" >> /etc/apt/sour
     rm ./get-pip.py && \
 
 # Install other Python 3 packages
+    pip3 install -U --upgrade-strategy only-if-needed --no-cache-dir apache-airflow==1.9.0 && \
     pip3 install -U --upgrade-strategy only-if-needed --no-cache-dir numpy==1.11.2 && \
     pip3 install -U --upgrade-strategy only-if-needed --no-cache-dir pandas==0.19.1 && \
     pip3 install -U --upgrade-strategy only-if-needed --no-cache-dir scipy==0.18.0 && \

third_party/license.txt

@@ -4744,3 +4744,17 @@ distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
+"""
+airflow
+"""
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.