pylint: Fix warning 'unnecessary "else" after "return"'

Recent pylint versions warn against the use of an 'else' in a
'try-except' block if using a 'return' on the 'except' part is is the
idom used by ansible-freeipa when retrieving IPA data objects.

This change removes the usage of the 'else:' in such cases, and modify
the templates so that new modules do not have the same issue in the
future.