* gh-3741:
  Make it easier to subclass Launchers

Change constructors from `package private` to `protected` for subclasses
to use.

Closes gh-3741

Introduce ManagementServletContext interface as a facade for
ManagementServerProperties to resolve the package tangle between
`o.s.boot.actuate.endpoint.mvc` and `o.s.boot.actuate`

Fixes gh-3887

Fixes gh-3893

Update SpringApplicationContextLoader so that setRegisterShutdownHook
is false for tests.

Fixes gh-3763

See gh-3856

Previously, RemoteDevToolsAutoConfiguration would try to configure
Spring Security if it was on the classpath. This led to a failure if
Spring Security was on the classpath but its auto-configuration was
disabled.

This commit updates the auto-configuration to be conditional on the
presence of Spring Security’s ObjectPostProcessor bean.

See gh-3889

Previously, if an app had Spring Security on the classpath the remote
devtools server would be secured using basic authentication. This
prevented RemoteSpringApplication from uploading changes to the server
as they would be rejected with a 401.

This commit updates RemoteDevToolsAutoConfiguration to allow anonymous
access to the remote server. CSRF protection is also disabled so that
POST requests without a CSRF token will be accepted.

Closes gh-3889

Closes gh-3892

This reverts commit 678f36cf.

Extract a HazelcastInstanceFactory class and cleanup some formatting.

See gh-2942

Closes gh-3880

Closes gh-3879

Closes gh-3878

Closes gh-3877

Closes gh-3876

Closes gh-3875

Closes gh-3874

Closes gh-3873

Closes gh-3872

Closes gh-3871

Closes gh-3870

Closes gh-3869

Closes gh-3779

Closes gh-3868

* pr/3831:
  Polish contribution
  Do not attempt to restart non-restartable jobs

Closes gh-3831

Closes gh-3830

Closes gh-3846

* pr/3866:
  Add link to Hazelcast documentation

Closes gh-3866