Initial release of context service

manifests/contextservice.yaml

manifests/redisdb.yaml

src/build.sh

src/common/tools/RetryDecorator.py

src/common/tools/__init__.py

src/context/Config.py

src/context/Dockerfile_develop

src/context/Dockerfile_test

src/context/__init__.py

src/context/client/ContextClient.py

src/context/client/__init__.py

src/context/data/topo_nsfnet.json

src/context/database/Factory.py

src/context/database/__init__.py

src/context/database/inmemory/InMemoryDatabase.py

src/context/database/inmemory/__init__.py

src/context/database/redis/RedisDatabase.py

src/context/database/redis/__init__.py

src/context/genproto.sh

src/context/proto/__init__.py