Skyld AV uses problematic syslog log tag and sometimes calls syslog() before openlog()

Wolfram Schlich indentified the following issues:
- syslog() used instead of Messaging::Message
- Error written even if PID file was successfully created.
- Identifier for syslog should not contain space.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Merge branch 'master' of https://github.com/xypron/skyldav