Remove lightly used variables

An RDFLib namespace dictionary can take a `Namespace` object as its
value.  So, this patch aligns variable definition practice with
elsewhere in this code base, not separating out an `IRI_` variable for
each namesapce.

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Author: ajnelson-nist

tests/case_utils/case_file/test_case_file.py

@@ -22,19 +22,15 @@
 
 _logger = logging.getLogger(os.path.basename(__file__))
 
-IRI_UCO_CORE = "https://unifiedcyberontology.org/ontology/uco/core#"
-IRI_UCO_OBSERVABLE = "https://unifiedcyberontology.org/ontology/uco/observable#"
-IRI_UCO_TYPES = "https://unifiedcyberontology.org/ontology/uco/types#"
-
 NS_RDF = rdflib.RDF
-NS_UCO_CORE = rdflib.Namespace(IRI_UCO_CORE)
-NS_UCO_OBSERVABLE = rdflib.Namespace(IRI_UCO_OBSERVABLE)
-NS_UCO_TYPES = rdflib.Namespace(IRI_UCO_TYPES)
+NS_UCO_CORE = rdflib.Namespace("https://unifiedcyberontology.org/ontology/uco/core#")
+NS_UCO_OBSERVABLE = rdflib.Namespace("https://unifiedcyberontology.org/ontology/uco/observable#")
+NS_UCO_TYPES = rdflib.Namespace("https://unifiedcyberontology.org/ontology/uco/types#")
 
 NSDICT = {
-    "uco-core": IRI_UCO_CORE,
-    "uco-observable": IRI_UCO_OBSERVABLE,
-    "uco-types": IRI_UCO_TYPES,
+    "uco-core": NS_UCO_CORE,
+    "uco-observable": NS_UCO_OBSERVABLE,
+    "uco-types": NS_UCO_TYPES,
 }
 
 SRCDIR = os.path.dirname(__file__)