Guys

See the attach patch, this implements a xentoollog consumer that can log 
in to syslog

Following are the changes

xentoollog.h:
1) Generic, xtl_logger_set_minlevel and xtl_logger_adjust_flags 
functions to be called from outside,
2) Making logger flags to be more generic
3) Change the struct xentool_logger, each logger will implement its own 
"set_minlevel" and "adjust_flags"  which will be invoked by 
xtl_logger_set_minlevel and xtl_logger_adjust_flags generic functions.
4) New function prototype to create a xentool_logger_syslogger

Going forward I would like to suggest that xentoollog.h file should only 
have generic functions, except for xtl_createlogger_* functions. Logger 
type specific function should not be included(e.g 
xtl_stdiostream_set_minlevel ) this will make sure outside code can 
switch from one logger to another (from stdiologger to syslogger vice 
versa) with out breaking the code.

xtl_core.c:
1) Implementation of xtl_logger_set_minlevel and xtl_logger_adjust_flags 
functions.

xtl_logger_syslog.c :
New logger implementation to log in to syslog.


I did some testing by changing the code in xl. This seems to work, but I 
would really like if more people can test this.
Also could someone look @ the syslogger_progress function and add any 
extra bits if needed, I did a very basic implementation of this.  

Signed-off-by : Gihan Munasinghe <GMunasinghe@flexiant.com>


Thanks
Gihan