Broken unit_tests.test_nova_cc_utils.NovaCCUtilsTests after r70

[Description]

Unit tests broken After r70 changes

  Fix authorized_keys file becomes incorrect after removing a compute node and
  then add a new node.

======================================================================
FAIL: test_ssh_compute_remove (unit_tests.test_nova_cc_utils.NovaCCUtilsTests)
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Traceback (most recent call last):
  File "/home/niedbalski/src/lp-1300142/nova-compute/env/local/lib/python2.7/site-packages/mock.py", line 1201, in patched
    return func(*args, **keywargs)
  File "/home/niedbalski/src/lp-1300142/nova-cloud-controller/unit_tests/test_nova_cc_utils.py", line 417, in test_ssh_compute_remove
    _file.write.assert_called_with(keys_removed)
  File "/home/niedbalski/src/lp-1300142/nova-compute/env/local/lib/python2.7/site-packages/mock.py", line 835, in assert_called_with
    raise AssertionError(msg)
AssertionError: Expected call: write('\nssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC27Us7lSjCpa7bumXAgc nova-compute-1\nssh-rsa CCCCB3NzaC1yc2ECCCCDCQCBCCCBCQC27Us7lSjCpa7bumXCgc nova-compute-3\n')
Actual call: write('\nssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQC27Us7lSjCpa7bumXAgc nova-compute-1\nssh-rsa CCCCB3NzaC1yc2ECCCCDCQCBCCCBCQC27Us7lSjCpa7bumXCgc nova-compute-3\n\n')

[ Solution ]

Merge request linked.