Merge branch 'gcp-anthos' into 'master'

NOTICE

pom.xml

provider/notification-reference/README.md

...rnetes/deployments/deployment-os-notification-service.yml

provider/notification-reference/pom.xml

...oup/osdu/notification/provider/reference/Application.java

...on/provider/reference/config/PropertiesConfiguration.java

...ion/provider/reference/pubsub/PubsubHandshakeHandler.java

...provider/reference/pubsub/PubsubRequestBodyExtractor.java

...ification/provider/reference/security/SecurityConfig.java

...u/notification/provider/reference/util/AppProperties.java

...ion/provider/reference/util/GoogleServiceAccountImpl.java

...eference/util/GoogleServiceAccountValidatorGenerator.java

...der/reference/util/GoogleServiceAccountValidatorImpl.java

...sdu/notification/provider/reference/util/JwtValidity.java

...ovider/reference/util/ServiceAccountJwtGcpClientImpl.java

...ation-reference/src/main/resources/application.properties

...der/notification-reference/src/main/resources/logback.xml

...tion/util/GoogleServiceAccountValidatorGeneratorTest.java

...fication/util/GoogleServiceAccountValidatorImplTests.java