pywbem / pywbemtools / 3687

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Fixed #650: Sorted and added missing properties in table output of instances

Details:

* When the set of instances to be displayed in a table format had different
  sets of properties, there were cases when not all properties were
  displayed. The algorithm for determining the set of properties to be
  displayed simply determined the instance with the largest number of
  properties and used their names. This change fixes that by determining
  the set of properties to be displayed by adding all differently named
  properties in all instances into the set to be displayed.

* In addition, this change sorts the determined properties such that
  first the key properties are displayed in sorted order, and then
  the non-key properties in sorted order. Any property name comparisons
  and the sorting are done case insenitively. The key properties are
  determined fro the path of the instances, without causing any additional
  class retrieval operations.

* Added testcases for the missing property case.

* Corrected comments on the testcase definition structures, and made
  the function and structure names more consistent, for
  _format_instances_as_rows() and _print_instances_as_table().

Signed-off-by: Andreas Maier <andreas.r.maier@gmx.de>

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