_ensureDirectoryExists doesn't work properly with broken soft links

[autumnpat]

SwiftPullArtefact@get-build-image-from-swift: EXCEPTION: Attempt to execute step 'get-build-image-from-swift' in phase 'pull' failed
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/Csmake/CliDriver.py", line 771, in launchStep
    result = method(stepdict)
  File "/usr/lib/python2.7/dist-packages/CsmakeProviders/CsmakeModules/SwiftPullArtefact.py", line 147, in pull
    self._ensureDirectoryExists(targetFile)
  File "/usr/lib/python2.7/dist-packages/Csmake/CsmakeModule.py", line 298, in _ensureDirectoryExists
    os.makedirs(directory)
  File "/usr/lib/python2.7/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 17] File exists: './target/archives'
` EXCEPTION: Attempt to execute step get-build-image-from-swift failed
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/Csmake/CliDriver.py", line 809, in launchStep
    raise e
OSError: [Errno 17] File exists: './target/archives'

target/archives is a broken link

[autumnpat]

csmake-hpe#10