Adapted .function files and .data files to new test framework

Changes include:
 - Integers marked with '#' in the .function files.
 - Strings should have "" in .data files.
 - String comparison instead of preprocessor-like replace for e.g. '=='
 - Params and variables cannot have the same name in .function files

tests/suites/test_suite_error.function

@@ -7,7 +7,7 @@ depends_on:POLARSSL_ERROR_C
 END_DEPENDENCIES
 
 BEGIN_CASE
-error_strerror:code:result_str
+error_strerror:#code:result_str
 {
     char buf[500];