Avoid using whitespace in test_safe_parse_xml.

Updates the test_safe_parse_xml test case in
cinder.tests.test_utils.GenericUtilsTestCase to avoid using
whitespaces and to ignore extraneous newlines returned in the
parsed XML.  This is required to work around differences in
the output from minidom in python 2.6.

Fixes LP Bug #1172352.

Change-Id: I48bdf3cb8eed3e65f7ceaeb1c2b19aa529c930d0
Merge "Avoid using whitespace in test_safe_parse_xml."