Remove "forcedWorkspaceCleanup" option

It is superseded by the CreateWorkspace() function and task step (which
removes and recreates a workspace), and this option was not actually
used in any function except for the build of unit tests, but no XML
step actually specified this option.

ci-scripts/cls_cluster.py

@@ -70,7 +70,6 @@ def OC_logout(cmd):
 class Cluster:
 	def __init__(self):
 		self.eNBSourceCodePath = ""
-		self.forcedWorkspaceCleanup = False
 		self.OCUserName = ""
 		self.OCPassword = ""
 		self.OCProjectName = ""