testSecurity: don't skip portal_components in test_method_protection

We have been using `filter(lambda x:'/erp5/' in x[0], error_list)` as a
way to see only missing declarations from ERP5 code, but only ERP5
filesystem code contains /erp5/ in the filenames, in-ZODB components
filename is set to something like <portal_components/document.erp5.FTPConnector>

Change to also check methods for which filename contains <portal_components
and also to print the ignored methods