Change 19090

Paul Allen
Revert files before deleting a Workspace.

JENKINS-24070

Jenkins Log (successful delete):
Apr 21, 2016 10:08:20 PM org.jenkinsci.plugins.p4.PerforceScm processWorkspaceBeforeDeletion
INFO: processWorkspaceBeforeDeletion
Apr 21, 2016 10:08:20 PM org.jenkinsci.plugins.p4.tasks.RemoveClientTask invoke
INFO: Task: remove client.
Apr 21, 2016 10:08:20 PM org.jenkinsci.plugins.p4.tasks.RemoveClientTask invoke
INFO: P4: unsyncing client: jenkins-master-open
Apr 21, 2016 10:08:20 PM org.jenkinsci.plugins.p4.tasks.RemoveClientTask invoke
INFO: P4: remove client: jenkins-master-open
Apr 21, 2016 10:08:20 PM org.jenkinsci.plugins.p4.PerforceScm processWorkspaceBeforeDeletion
INFO: clean: true
2 edited 0 added 0 deleted
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