Merge branch 'stable-2.16' into stable-3.0

Update Docker image to 3.0.15 matching plugin API for build. Also remove
StorageException from catch blocks that include RuntimeException since
its a subclass.

* stable-2.16:
  fixup! test/docker: Use gerritcodereview docker image
  Add counts to Task headers
  Task UI: Add links to see full view of all tasks
  Add Bazel support for running docker tests
  test/docker: Use gerritcodereview docker image
  Revert "plugin:task Adds support for names-factory of type change"
  Remove Maven build
  Task UI: Add status icons
  TaskAttributeFactory: Consistently cache predicates
  task: Remove unthrown exception
  TaskAttributeFactory turn more Exceptions into INVALID tasks
  plugin:task Adds support for names-factory of type change
  Add support for tasks-factory and names-factory keywords
  task plugin tests: handle missing refs/users/self
  Task UI In Progress
  Refactor docker test setup
  Use a shorter docker test script name
  Support to run shell script tests in docker environment

Change-Id: I19ab044fffc4e8c3f6e21988975f03a414753318