Add detection tests for incorrect license detection in dragon4.c

Signed-off-by: Kaushik <kaushikrjpm10@gmail.com>

Author: Kaushik-Kumar-CEG

tests/licensedcode/data/false_positive/dragon4.c

@@ -0,0 +1 @@
+As a special exception the smallest normal value

tests/licensedcode/data/false_positive/dragon4.c.yml

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+license_detections: []
+license_clues: []

tests/licensedcode/data/licenses_misc/negative/license-intro_8.txt

@@ -0,0 +1 @@
+As a special exception

tests/licensedcode/data/licenses_misc/negative/license-intro_8.txt.yml

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+license_detections: []
+license_clues:
+  - license_expression: generic-exception
+    license_expression_spdx: LicenseRef-scancode-generic-exception
+    from_file: license-intro_8.txt
+    start_line: 1
+    end_line: 1
+    matcher: 1-hash
+    score: 100.0
+    matched_length: 3
+    match_coverage: 100.0
+    rule_relevance: 100
+    rule_identifier: license-intro_8.RULE
+    rule_url: https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/license-intro_8.RULE