Update cucm_query.py

Just cleaning up that String; Added LXML Library (you'll have to easy_install lxml and/or pip easy_install? however that syntax works); The Document (soap_env) and the Last Element in the XML Document are GLOBAL Variables..the last element is <sql></sql> (we want to createTextNode on that by calling the .text instance variable of the class and setting that value to the passed in Select Statement)