[syslog-ng] specifying hostname for unix-stream sources

[william.batt at abnamro.com]

This may sound like a strange request, but I would like to override the 
default hostname for messages originating from unix-stream sources.  The 
hostname (understandably) defaults to the server hostname.  For 
"corporate" reasons I cannot change the hostname but need the syslog-ng 
messages to contain the hostname of a subinterface associated with my 
application.  Also for "corporate" reasons I cannot completely replace 
syslog but need to run syslog-ng in parallel with it using separate 
sockets (e.g., /dev/log-ng).  Is this possible?

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