skytools.skylog: initial implementation of UdpTNetStringsHandler
skytools.skylog: moved hostaddr resolving to module init

No need to do it per log call as hostname is constant currently.
skytools.skylog: added more fields to UdpTNetStringsHandler log message
Merge branch 'feature/skylog_tnetstrings_via_udp' into develop
Merge branch 'master' of https://github.com/markokr/skytools into develop