Check_MK: stable release 1.4.0p17

REF: http://mathias-kettner.de/check_mk_download.html

...the new stable release 1.4.0p17 of Check_MK is ready for download.

This maintenance release ships with 18 changes affecing all editions of Check_MK,
2 Enterprise Edition specific changes and 1 Managed Services Edition specific changes.