Replaced TODOs in cim_obj.py with Notes.

Details:

- One group of TODOs was removed that was about removing a note
  about what pywbem assumes for a missing definition in DSP0004.
  Because it is not expected that there is an update of DSP0004
  in the near future, we don't want to get bothered by the TODO,
  and think the note is sufficient.

- A second TODO was changedinto a note: The tocimobj() function
  has a limitation to not support nested double quoting. because
  we want to transition all uses of tocimobj() to use cimvalue(),
  we will not lift this limitation, and so the TODO has been
  changed into a note pointing out the limitation.

Signed-off-by: Andreas Maier <maiera@de.ibm.com>

pywbem/cim_obj.py

@@ -1935,12 +1935,10 @@ def _kbstr_to_cimval(key, val):
             # Note: The actual definition of referenceValue is missing in
             # DSP0207, see issue #929. Pywbem implements:
             # referenceValue = WBEM-URI-UntypedInstancePath.
-            # TODO 01/18 AM Remove note once referenceValue is def'd in DSP0207
 
             # Note: The definition of stringValue in DSP0004 allows multiple
             # quoted parts (as in MOF), see issue #931. Pywbem implements only
             # a single quoted part.
-            # TODO 01/18 AM Remove note once stringValue is fixed in DSP0207
 
             # We use slicing instead of strip() for removing the surrounding
             # double quotes, because there could be an escaped double quote
@@ -1972,7 +1970,6 @@ def _kbstr_to_cimval(key, val):
             # Note: The definition of charValue in DSP0004 allows for integer
             # numbers in addition to single quoted strings, see issue #932.
             # Pywbem implements only single quoted strings.
-            # TODO 01/18 AM Remove note once charValue is fixed in DSP0207
 
             cimval = val[1:-1]
             cimval = re.sub(r'\\(.)', r'\1', cimval)
@@ -7110,7 +7107,8 @@ def tocimobj(type_, value):
 
     if type_ == 'reference':  # pylint: disable=too-many-nested-blocks
         # pylint: disable=too-many-return-statements,too-many-branches
-        # TODO doesn't handle double-quoting, as in refs to refs.  Example:
+
+        # Note: This doesn't handle double-quoting, as in refs to refs. Example:
         # r'ex_composedof.composer="ex_sampleClass.label1=9921,' +
         #  'label2=\"SampleLabel\"",component="ex_sampleClass.label1=0121,' +
         #  'label2=\"Component\""')