New journald script

Requires OpenLMI journald provider 0.4.2 (MOF version number) and higher.
journald: Fix authorship
journald: Add provider version requirement test

The journald script makes use of newly added LMI_JournalMessageLog.
PositionToLastRecord() method, let's add explicit version check.
Merge pull request #80 from tbzatek/master

New journald script