8286969: Add a new test library API to execute kinit in SecurityTools.java

Reviewed-by: rhalade, weijun

test/lib/jdk/test/lib/SecurityTools.java

@@ -225,6 +225,18 @@ public class SecurityTools {
         return execute(getProcessBuilder("klist", makeList(args)));
     }
 
+    /**
+     * Runs kinit.
+     *
+     * @param args arguments to kinit in a single string. The string is
+     *             converted to be List with makeList.
+     * @return an {@link OutputAnalyzer} object
+     * @throws Exception if there is an error
+     */
+    public static OutputAnalyzer kinit(String args) throws Exception {
+        return execute(getProcessBuilder("kinit", makeList(args)));
+    }
+
     /**
      * Runs jar.
      *