feat(python_linting): added ci job, python linting, code quality and scoring

Added a job to lint python files and ouput a code quality report for gitlab MR.

A html report is also available within the artifacts. if the badge is used,
the badge links to the html code quality report.

 Changes to be committed:
	modified:   .gitlab-ci.yml
	new file:   python/.gitlab-ci.yml
	new file:   python/README.md
	new file:   python/requirements.txt

issue #1

python/.gitlab-ci.yml

@@ -0,0 +1,49 @@
+
+.pylint_badge: &pylint_badge |
+    echo "{
+        \"PyLintScore\": \"$PyPIScore\"
+    }" > "$CI_PROJECT_DIR/artifacts/$CI_JOB_STAGE/$CI_JOB_NAME/badge_pylint.json"
+
+.PyLint:
+    variables:
+        PYLINT_PATH: "/*/python-module/*/*.py"
+    stage: validation
+    before_script:
+        - if [ "0$JOB_ROOT_DIR" == "0" ]; then ROOT_DIR=gitlab-ci; else ROOT_DIR=$JOB_ROOT_DIR ; fi
+        - echo "[DEBUG] ROOT_DIR[$ROOT_DIR]"
+        - mkdir -p "$CI_PROJECT_DIR/artifacts/$CI_JOB_STAGE/$CI_JOB_NAME"
+        - mkdir -p "$CI_PROJECT_DIR/artifacts/$CI_JOB_STAGE/tests"
+        - export PYTHON_VERSION=`python -c 'import sys; version=sys.version_info[:3]; print("{0}.{1}.{2}".format(*version))'`
+        - apt update
+        - apt install --no-install-recommends -y git
+        - python3 -m venv env
+        - . env/bin/activate
+        - pip install --upgrade pip
+        - pip install -r $ROOT_DIR/python/requirements.txt
+        - mkdir $PYTHON_VERSION
+    script:
+        - PYLINT_PATH=$ROOT_DIR$PYLINT_PATH
+        - echo "[DEBUG] PYLINT_PATH[$PYLINT_PATH]"
+        - python3 -m pylint --exit-zero --output-format=pylint_gitlab.GitlabCodeClimateReporter $PYLINT_PATH > "$CI_PROJECT_DIR/artifacts/$CI_JOB_STAGE/tests/gl-code-quality-report.json"
+
+        - python3 -m pylint --exit-zero --output-format=pylint_gitlab.GitlabPagesHtmlReporter $PYLINT_PATH > "$CI_PROJECT_DIR/artifacts/$CI_JOB_STAGE/tests/gl-code-quality-report.html"
+
+        - PyPIScore=$(python3 -m pylint --exit-zero $PYLINT_PATH | sed -n 's/^Your code has been rated at \([-0-9./]*\).*/\1/p')
+
+        - *pylint_badge
+
+
+    after_script:
+        - echo deactivate
+    artifacts:
+        expire_in: 1 days
+        when: always
+        paths:
+            - "artifacts/*"
+        reports:
+            codequality: "$CI_PROJECT_DIR/artifacts/$CI_JOB_STAGE/tests/gl-code-quality-report.json"
+    rules:
+        - if: '$CI_COMMIT_BRANCH'
+          when: always
+        - when: never
+