[maven-release-plugin] copy for tag jenkins-1.512

[JENKINS-17648] Bump ssh-slaves version to effectively backport 71a85…

…21cb5537b29bd32424dfe05d87e1c8d218f

[maven-release-plugin] copy for tag jenkins-1.511

[maven-release-plugin] copy for tag jenkins-1.510

[maven-release-plugin] copy for tag jenkins-1.509

[maven-release-plugin] copy for tag jenkins-1.508

[maven-release-plugin] copy for tag jenkins-1.507

[maven-release-plugin] copy for tag jenkins-1.506

[maven-release-plugin] copy for tag jenkins-1.505

[maven-release-plugin] copy for tag jenkins-1.504