cdash: report clean results to CDash server (#9564)

* Record stdout for packages without errors

  Previously our reporter only stored stdout if something went wrong
  while installing a package.  This prevented us from properly reporting
  on steps where everything went as expected.

* More robustly report all phases to CDash

  Previously if a phase generated no output it would not be reported to CDash.
  For example, consider the following output:

    ==> Executing phase: 'configure'
    ==> Executing phase: 'build'

  This would not generate a report for the configure phase. Now it does.

* Add test case for CDash reporting clean builds

* Fix default directory for CDash reports

  The default 'cdash_report' directory name was getting overwritten
  by 'junit-report'.

* Upload the build phase first to CDash

  Older versions of CDash expect Build.xml to be the first file uploaded
  for any given build.

* Define cdash_phase before referring to it

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