Refactoring NBI decriptor_topics unit tests,
enabling stage-test to fail with tox results

Test_VnfdTopic and Test_NsdTopic classes are refactored.

Change-Id: Ic8e8310f2c2913cf07ff25755f1a2196d16eb944
Signed-off-by: aticig <gulsum.atici@canonical.com>
diff --git a/requirements-test.txt b/requirements-test.txt
index fbbf879..24cfd87 100644
--- a/requirements-test.txt
+++ b/requirements-test.txt
@@ -38,7 +38,7 @@
     #   nose2
 deepdiff==5.8.1
     # via -r requirements-test.in
-idna==2.10
+idna==3.3
     # via
     #   requests
     #   yarl
@@ -54,7 +54,7 @@
     # via deepdiff
 pyang==2.5.3
     # via -r requirements-test.in
-requests==2.25.1
+requests==2.28.0
     # via -r requirements-test.in
 six==1.16.0
     # via nose2