report: More problems with datetime (bnc#874162)

* fix none-handling in make_datetime
* update get_rpt_dt for datetime handling
* log_seek(): Don't try to ts-convert datetime objects
test: Failing test for actions in resource sets (#14)
parse: Fix check for action/role in resource set parser (#14)
Merge pull request #16 from krig/action-in-rscset

Fix bug checking action / role in resource set parser (#14)
Merge pull request #15 from krig/datetime-fixes

report: More problems with datetime (bnc#874162)