Add OpenFaaS Clear Linux based python3 template

Signed-off-by: Qi Zheng <qi.zheng@intel.com>

FaaS/OpenFaaS/template/README.md

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+# OpenFaaS template based on Clear Linux
+
+## How to use the template
+
+Assume you already had deployed workable OpenFaaS on top of Kubernetes.
+
+Steps could refer to
+
+[deployment-guide-for-kubernetes](https://docs.openfaas.com/deployment/kubernetes/#deployment-guide-for-kubernetes)
+
+[OpenFaaS workshop](https://github.com/openfaas/workshop)
+
+### python3-clearlinux
+1.  `mkdir test && cd test`
+2.  `cp -r "<your-dockerfiles-path>"/FaaS/OpenFaaS/template/. template/`
+3.  `faas-cli new --lang python3-clearlinux hello-openfaas --prefix="<your-docker-username-here>"`
+
+    Files tree as below.
+>  
+    ├── hello-openfaas
+    │   ├── bundles.txt
+    │   ├── handler.py
+    │   ├── __init__.py
+    │   └── requirements.txt
+    ├── hello-openfaas.yml
+    └── template
+
+
+    *  Put the required python packages in the "requirements.txt".
+    For example,
+
+    `echo "redis" >> hello-openfaas/requirements.txt`
+    `echo "flask" >> hello-openfaas/requirements.txt`
+
+    *  Put the required Clear Linux bundles in the "bundles.txt".
+    For example,
+
+    `echo "openblas" >> hello-openfaas/bundles.txt`
+    `echo "wget" >> hello-openfaas/bundles.txt`
+4.  `faas-cli up -f hello-openfaas.yml`
+
+    Then you can invoke your python function by OpenFaas UI or faas-cli.
+    
+## Proxy and Clear Linux mirror
+
+When working behind a Proxy, you can pass proxy settings to faas-cli commands by "--build-arg".
+
+Also to speed up the Clear Linux bundle install, you could use mirror if you are inside Intel.
+
+For example, 
+
+`faas-cli up --build-arg http_proxy=$http_proxy --build-arg https_proxy=$https_proxy --build-arg swupd_args="-u $mirror --allow-insecure-http" -f hello-openfaas.yml`

FaaS/OpenFaaS/template/python3-clearlinux/Dockerfile

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+FROM openfaas/classic-watchdog:0.18.1 as watchdog
+
+FROM clearlinux/python:3
+
+ARG swupd_args
+
+COPY --from=watchdog /fwatchdog /usr/bin/fwatchdog
+RUN chmod +x /usr/bin/fwatchdog
+
+WORKDIR /root/
+
+COPY index.py           .
+# pip install python packages if required
+COPY requirements.txt   .
+RUN pip install -r requirements.txt
+
+# install bundles if required
+# PLEASE input bundle line by line
+COPY bundles.txt  .
+RUN for bundle in $(cat bundles.txt); do \
+        swupd bundle-add $bundle $swupd_args; \
+    done
+
+RUN mkdir -p function
+RUN touch ./function/__init__.py
+WORKDIR /root/function/
+# pip install python packages if required
+COPY function/requirements.txt  .
+RUN pip install -r requirements.txt
+
+# install bundles if required
+# PLEASE input bundle line by line
+COPY function/bundles.txt  .
+RUN for bundle in $(cat bundles.txt); do \
+        swupd bundle-add $bundle $swupd_args; \
+    done
+
+WORKDIR /root/
+COPY function           function
+
+ENV fprocess="python3 index.py"
+EXPOSE 8080
+
+HEALTHCHECK --interval=3s CMD [ -e /tmp/.lock ] || exit 1
+
+CMD ["fwatchdog"]

FaaS/OpenFaaS/template/python3-clearlinux/function/handler.py

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+def handle(req):
+    """handle a request to the function
+    Args:
+        req (str): request body
+    """
+
+    return req

FaaS/OpenFaaS/template/python3-clearlinux/index.py

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+# Copyright (c) Alex Ellis 2017. All rights reserved.
+# Copyright (c) OpenFaaS Author(s) 2018. All rights reserved.
+# Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+import sys
+from function import handler
+
+def get_stdin():
+    buf = ""
+    while(True):
+        line = sys.stdin.readline()
+        buf += line
+        if line == "":
+            break
+    return buf
+
+if __name__ == "__main__":
+    st = get_stdin()
+    ret = handler.handle(st)
+    if ret != None:
+        print(ret)

FaaS/OpenFaaS/template/python3-clearlinux/template.yml

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+language: python3
+fprocess: python3 index.py