Skriv flere tester

https://jira.usit.uio.no/browse/CRISTIN-130

Mer tester pluss fiksing av oppdagede feil

• Test get_iga_data with iga cache
• Test more code paths in add_persons
• Fix regex
• Fix nullpointer exception in get_valid_upstream
• Add tests for tools module
• Inline simple phone_string function
• Add missing dictionary access in test
• Add and rewrite tests
• Use correct date format in fixtures
• Depaginate greg persons response
• Raise exception on transport error from greg