0.5.2-rc0

Change Log

Exposing Segmentstore Service on single IP (#430)
Controller Readiness probe is failing in case of ingress(#432)
Moving Travis builds to CNCF (#437)
Documentation update(#438)
Configmap name change to support upgrade(#441)
Fixing Intermittent E2E test failure(#435)
Handling Pravega metadata deletion(# 399)
Post upgrade script for helm upgrades(#439)
Modifying travis file to add retry logic(#444)
Reuse values for helm releases in post-upgrade script(#445)
Rollback fails in case of only 1 Segment Store Pod (#449)
OpenApiSchemaValidation added (#447)
Updating documentation and charts(#453)
Correcting Travis build(#452)
Correcting setup script and updating documentation (#452)