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)..had to change the SOAPAction to 8.5 as well..