Use pytest traceback style option from pytest.ini

Do not use hardcoded 'short' traceback style
option in pytest run CLI command, but the value
that is defined in pytest.ini config.

Change-Id: I1172a5d4ad4fba6ffa48c35fa9433a66b0bac8ba
Related-PROD: #PROD-23832
(cherry picked from commit 6749a376be28e2a433271144cd26ebb5576bd650)
diff --git a/cvp-runner.groovy b/cvp-runner.groovy
index 4a4a8b6..edbe902 100644
--- a/cvp-runner.groovy
+++ b/cvp-runner.groovy
@@ -48,7 +48,7 @@
                 def container_workdir = '/var/lib'
                 def workdir = "${container_workdir}/${test_suite_name}"
                 def tests_set = (env.getProperty('tests_set')) ?: ''
-                def script = "pytest --junitxml ${container_workdir}/${artifacts_dir}/${xml_file} --tb=short -vv ${tests_set}"
+                def script = "pytest --junitxml ${container_workdir}/${artifacts_dir}/${xml_file} -vv ${tests_set}"
 
                 sh "mkdir -p ${artifacts_dir}"