Handle dockeroutputDirectory when it is a root directory i.e. starts with /, as on windows OS Drive letter remains appended on doing os.realpath hence not allowing root Directory formation
Handle dockeroutputDirectory when it is a root directory i.e. starts with /, as on windows OS Drive letter remains appended on doing os.realpath hence not allowing root Directory formation

dleehr/cwltool,common-workflow-language/cwltool,dleehr/cwltool,dleehr/cwltool,common-workflow-language/cwltool,dleehr/cwltool,common-workflow-language/cwltool