retrieve activity messages when closing repository fails

[gabrielittner]

With this the plugin will try to retrieve the error messages when closing failed and then print them. In case retrieving them doesn't work it falls back the current error message that directs users to the sonatype website.

* What went wrong:
Failed to stop service 'sonatype-repository-build-service'.
> Closing the repository failed with the following errors:
  Missing Signature: '/com/gabrielittner/maven/publish/com.gabrielittner.maven.publish.gradle.plugin/gabriel-test1/com.gabrielittner.maven.publish.gradle.plugin-gabriel-test1.pom.asc' does not exist for 'com.gabrielittner.maven.publish.gradle.plugin-gabriel-test1.pom'.
  Missing Signature: '/com/gabrielittner/maven/publish/base/com.gabrielittner.maven.publish.base.gradle.plugin/gabriel-test1/com.gabrielittner.maven.publish.base.gradle.plugin-gabriel-test1.pom.asc' does not exist for 'com.gabrielittner.maven.publish.base.gradle.plugin-gabriel-test1.pom'.
  Missing Signature: '/com/gabrielittner/test/nexus/gabriel-test1/nexus-gabriel-test1-sources.jar.asc' does not exist for 'nexus-gabriel-test1-sources.jar'.
  Missing Signature: '/com/gabrielittner/test/nexus/gabriel-test1/nexus-gabriel-test1.pom.asc' does not exist for 'nexus-gabriel-test1.pom'.
  Missing Signature: '/com/gabrielittner/test/nexus/gabriel-test1/nexus-gabriel-test1.jar.asc' does not exist for 'nexus-gabriel-test1.jar'.
  Missing Signature: '/com/gabrielittner/test/nexus/gabriel-test1/nexus-gabriel-test1-javadoc.jar.asc' does not exist for 'nexus-gabriel-test1-javadoc.jar'.
  Missing Signature: '/com/gabrielittner/test/nexus/gabriel-test1/nexus-gabriel-test1.module.asc' does not exist for 'nexus-gabriel-test1.module'.
  Missing Signature: '/com/gabrielittner/test/gradle-maven-publish-plugin/gabriel-test1/gradle-maven-publish-plugin-gabriel-test1.pom.asc' does not exist for 'gradle-maven-publish-plugin-gabriel-test1.pom'.
  Missing Signature: '/com/gabrielittner/test/gradle-maven-publish-plugin/gabriel-test1/gradle-maven-publish-plugin-gabriel-test1.module.asc' does not exist for 'gradle-maven-publish-plugin-gabriel-test1.module'.
  Missing Signature: '/com/gabrielittner/test/gradle-maven-publish-plugin/gabriel-test1/gradle-maven-publish-plugin-gabriel-test1.jar.asc' does not exist for 'gradle-maven-publish-plugin-gabriel-test1.jar'.
  Missing Signature: '/com/gabrielittner/test/gradle-maven-publish-plugin/gabriel-test1/gradle-maven-publish-plugin-gabriel-test1-javadoc.jar.asc' does not exist for 'gradle-maven-publish-plugin-gabriel-test1-javadoc.jar'.
  Missing Signature: '/com/gabrielittner/test/gradle-maven-publish-plugin/gabriel-test1/gradle-maven-publish-plugin-gabriel-test1-sources.jar.asc' does not exist for 'gradle-maven-publish-plugin-gabriel-test1-sources.jar'.

[vanniktech]

That's pretty neat!