[reSIProcate] rutil Log: give app control over syslog facility; don't hardcode LOCAL6

[John Gregg]

When I use the Log object to send logs to the syslog, the facility is 
hardcoded to LOG_LOCAL6 in SysLogBuf.cxx. Our app would rather use 
LOG_LOCAL0, given the filter we like to use in rsyslog. Rather than 
hardcode it to our preferred value, I have made it settable by the app. 
This entailed adding the new optional argument to Log::initialize, and 
down through the ThreadData object, then to SysLogStream and finally to 
SysLogBuf. The idea is quite simple, the messy part is all that new 
parameter passing, along with proper #ifdef WIN32. I didn't test with 
WIN32, but it should work OK, harmlessly ignoring the new facility.

The enclosed diffs are against the 1.9.6 versions in rutil.

-John Gregg

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