linkerd/linkerd2 stable-2.11.1

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stable-2.11.1

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This release relaxes the policy on the identity controller, allowing it to work
in more environments. It updates the CLI and Helm charts to indicate that the
minimum supported Kubernetes version is 1.17.0. It also fixes a number of bugs
in the CLI, multicluster extension, and proxy.

• Fixed incorrect opaque ports warning in linkerd check --proxy with un-named
  ports
• Updated linkerd check to avoid multiline errors with retryable checks
• Fixed multicluster gateway name for ServerAuthorization
• Removed unused crtExpiry template parameter from helm charts
• Updated minimum kubernetes version to 1.17.0
• Moved service mirror policy into multicluster base chart
• Added an -o short command-line flag for extension check commands
• Skipped Prometheus scrapes on policy's admin server so that it no longer
  incorrectly appears as "DOWN" in the Prometheus UI
• Updated the identity controller to use the 'all-unauthenticated' policy so
  that it can accept health checks from the node IPs
• Fixed a bug where authz CLI commands would fail when policy resources had an
  empty selector
• Fixed an infinite loop in the proxy that could cause it to be killed
• Fixed a bug where extension checks were rendered in the wrong format
• Changed the policy-controller to use jemalloc on x86_64 gnu/linux to reduce
  memory usage