Ticket 328 - make sure all internal search filters are properly escaped
    
    Bug Description:  Not all internal search fitlers are properly escaped.
    
    Fix Description:  Created a new sprintf type function, and a filter value escape function.
    
                      The sprintf function(slapi_filter_sprintf) varies from sprintf as you pass
                      a description argument before the value you want to escape/normalize:
    
                        ESC_NEXT_VAL          - escape the next argument
                        NORM_NEXT_VAL         - normalize the next argument
                        ESC_AND_NORM_NEXT_VAL - escape and normalize the next argument
    
                      In order to correctly normalize the value, the function also parses out the attribute
                      so we can get the syntax plugin normalization function.
    
                      As a side effect you must add an additional string format character for the description
                      arg(%s):
    
                             sprintf(buf,"cn=%s", value);
    
                             escaped_val = slapi_filter_sprintf("cn=%s%s", ESC_NEXT_VAL, value);
    
                      Also did some code cleanup.
    
    https://fedorahosted.org/389/ticket/328
    
    reviewed by: Noriko(Thanks!)