Remove qc_get_prepare_operation

Since the whole preparable statement will be available, it is
superfluous to provide a function using which the operation of
the preparable statement can be obtained.

include/maxscale/query_classifier.h

@@ -307,18 +307,6 @@ typedef struct query_classifier
      */
     int32_t (*qc_get_prepare_name)(GWBUF* stmt, char** name);
 
-    /**
-     * Reports the prepare operation.
-     *
-     * @param stmt  A statement.
-     * @param name  On return, the operation (one of @c qc_query_op_t) of a prepare
-     *              statement, if @c QC_RESULT_OK is returned.
-     *
-     * @return QC_RESULT_OK, if the parsing was not aborted due to resource
-     *         exhaustion or equivalent.
-     */
-    int32_t (*qc_get_prepare_operation)(GWBUF* stmt, int32_t* op);
-
     /**
      * Reports field information.
      *
@@ -584,17 +572,6 @@ qc_query_op_t qc_get_operation(GWBUF* stmt);
  */
 char* qc_get_prepare_name(GWBUF* stmt);
 
-/**
- * Returns the operator of the prepared statement, if the statement
- * is a PREPARE statement.
- *
- * @param stmt  A buffer containing a COM_QUERY packet.
- *
- * @return The operator of the prepared statement, if the statement
- *         is a PREPARE statement; otherwise QUERY_OP_UNDEFINED.
- */
-qc_query_op_t qc_get_prepare_operation(GWBUF* stmt);
-
 /**
  * Returns the preparable statement of a PREPARE statment. Other query classifier
  * functions can then be used on the returned statement to find out information