Add a repositories section to the spring-boot-dependencies POM but
strip it out during a CI build. This allows snapshot and milestone
BOM imports to be used but doesn't pollute published POMs and doesn't
prevent a fresh checkout from building.

Fixes gh-1413

Update `spring-boot-starter-data-rest` to remove duplicate jackson
dependencies.

Previously, the CLI relied on Aether using the session's mirror
selector and authentication selector to customize the configured
repositories. These selectors are only used to configure what Aether
calls recessive repositories (repositories discovered when resolving
an artifact), rather than the explicitly configured repositories that
are typically used.

This commit updates AetherGrapeEngine to apply mirror and
authentication configuration to every added repository, bringing its
behaviour for these two settings into line with what it already does
for proxy configuration.

Fixes #1354

* Windows: allow absolute file paths without file:/// prefix
* All: only add nested archives (not directories), so loader.path=lib/*
behaves the same as -classpath=lib/* (except for adding zip files)

Fixes gh-1352

The ExplodedArchive would erroneously always attempt to filter
its contents (and thereby shield them from a classloader that wrapped
it) even if they haven't been explicitly provided.

See gh-1352

Conflicts:
	spring-boot-dependencies/pom.xml

Closes #1409

Closes #1408

Closes #1407

Closes #1406

Closes #1405

Closes #1404

Closes #1402
Closes #1403

Closes #1401

Closes #1400

Closes #1399

Closes #1398

Closes #1389

* cleaning-up-maven-plugin-dependencies:
  Delete duplicate version numbers of Maven plugins

The Maven plugin version numbers are defined in the pluginManagement
of the spring-boot-dependencies pom.xml. Consequently, they can be
deleted in the spring-boot-starter-parent pom.xml to avoid version
conflicts and duplicated version management.

Fixes gh-1380

Use ant-run to clean spring-boot-samples when `clean` is invoked on
the main project.

Fix DefaultCounterService.reset to call the reset method of the
underlying MetricWriter.

Fixes gh-1391

Update StarterDependenciesIntegrationTests to only consider starter
folders that contain POM files.

Fixes gh-1395

Conflicts:
	spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/orm/jpa/JpaProperties.java