Support Maven's reproducible build feature for war repackaging

[Jurrie]

Support reproducable builds for WAR repackaging.

The Maven WAR plugin was fixed by MWAR-432 and MWAR-436. This has landed in version 3.3.1. Spring Boot already uses this version as of a35073d. So, this pull request is just a revert of c4a55a5.

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[Jurrie]

I did not actually test this with a Maven project yet. I can not get my Maven project to work with 2.5.0-SNAPSHOT.

I installed this in my local Maven repository using ./gradlew publishToMavenLocal -b spring-boot-project/spring-boot-tools/spring-boot-maven-plugin/build.gradle. When I run my Maven project, it uses 2.5.0-SNAPSHOT, but it fails because spring-boot-maven-plugin 2.5.0-SNAPSHOT needs spring-core 5.3.5-SNAPSHOT. But that artifact is not in the Spring Boot projects..?

[wilkinsona]

it fails because spring-boot-maven-plugin 2.5.0-SNAPSHOT needs spring-core 5.3.5-SNAPSHOT. But that artifact is not in the Spring Boot projects..?

That's correct. spring-core is part of Spring Framework. All Spring project snapshots are published to https://repo.spring.io/snapshot.

[wilkinsona]

Thanks very much for making your first contribution to Spring Boot, @Jurrie.