[Integrated] RFR: Standardize pr bot scratch folder names and detect invalid directories

[Robin Westberg]

Changeset: 77105e66
Author:    Robin Westberg <rwestberg at openjdk.org>
Date:      2020-02-11 10:26:03 +0000
URL:       https://git.openjdk.java.net/skara/commit/77105e66

Standardize pr bot scratch folder names and detect invalid directories

Reviewed-by: ehelin

! bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckWorkItem.java
! bots/pr/src/main/java/org/openjdk/skara/bots/pr/CommandWorkItem.java
! bots/pr/src/main/java/org/openjdk/skara/bots/pr/IntegrateCommand.java
! bots/pr/src/main/java/org/openjdk/skara/bots/pr/LabelerWorkItem.java
! bots/pr/src/main/java/org/openjdk/skara/bots/pr/SponsorCommand.java
! forge/src/main/java/org/openjdk/skara/forge/HostedRepositoryPool.java