chore(common): write debug output to console

We have a `g_debug_ToConsole` variable. However, so far this was
always set to true and output to `syslog`. This change modifies
the default to `false`, and in that case logs to `syslog`. If
`g_debug_ToConsole` is true we no output to the console.

When running the KMX unit tests we set `g_debug_ToConsole` to true.