Make Git ignore temporary and output files.

Ignore vim .swp files and files generated by creating ansible-freeipa
collection, when checking repository status.

.gitignore

 *.pyc
 *.retry
+*.swp
+
+# collection files
+freeipa-ansible_freeipa*.tar.gz
+redhat-rhel_idm*.tar.gz
+importer_result.json
 
 # ignore virtual environments
 /.tox/