a. Test Discovery is only found in python 2.7+. unittest2 makes it backwards compatible for python 2.4-2.6

b. Adding traceback from pymysql to debug problems in connecting with database
(cherry picked from commit 81218d718af0ec101f7ba424c62bb6e0b5642744)

tools/testClient/TestCaseExecuteEngine.py

@@ -1,4 +1,8 @@
-import unittest
+try:
+    import unittest2 as unittest
+except ImportError:
+    import unittest
+
 from functools import partial
 import os
 import sys
@@ -37,4 +41,4 @@ class TestCaseExecuteEngine(object):
         
         unittest.TextTestRunner(stream=self.testResultLogFile, verbosity=2).run(suite)
         
-        
+        

tools/testClient/dbConnection.py

@@ -2,6 +2,7 @@ import pymysql
 import cloudstackException
 import sys
 import os
+import traceback
 class dbConnection(object):
     def __init__(self, host="localhost", port=3306, user='cloud', passwd='cloud', db='cloud'):
         self.host = host
@@ -13,6 +14,7 @@ class dbConnection(object):
         try:
             self.db = pymysql.Connect(host=host, port=port, user=user, passwd=passwd, db=db)
         except:
+            traceback.print_exc()
             raise cloudstackException.InvalidParameterException(sys.exc_info())
         
     def __copy__(self):
@@ -73,4 +75,4 @@ if __name__ == "__main__":
     for i in range(10):
         result = db.execute("select job_status, created, last_updated from async_job where id=%d"%i)
         print result
-       
+