update ci to oas 3

.jenkins.sh

+#!/bin/bash
+
+specfiles=$(ls | egrep "^[^.]*.(json|yaml)")
+
+fres=0
+for i in $specfiles ; do
+    echo "-- Validating and linting OpenAPI file $i..."
+    swagger-cli validate $i
+    res=$?
+    speccy lint "$i"
+    res2=$?
+    fres=$(($fres||$res||$res2))
+    echo "--- Validator returned $res, linter returned $res2."
+done
+
+echo "-- Final validator returns $fres."
+exit $fres
+