Shell adaptor error with fork://localhost

[oleweidner]

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FAIL: Testing if a submitted job shows up in Service.list()
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Traceback (most recent call last):
  File "/Users/oweidner/Projects/saga-python/venv/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/Users/oweidner/Projects/saga-python/tests/unittests/api/job/test_service.py", line 57, in test_list_jobs
    assert False, "Unexpected exception: %s" % se
AssertionError: Unexpected exception: NoSuccess: find failed (unexpected EOF ()): mux_client_request_session: session request failed: Session open refused by peer
PTY allocation request failed on channel 0

[andre-merzky]

Error message improved, is a duplicate of #26.