Syslog ident must be provided explicitly.

The syslog ident must be provided explicitly when calling
skygw_logmanager_init (and not provided via the argv array).
It can be NULL, in which case it automatically will be the program
name.

The openlog() call is now always made, irrespective of what the
value of the global syslog flag is. That way it will be possible
to turn syslog logging on or off after the fact.

log_manager/log_manager.h

@@ -151,7 +151,10 @@ int mxs_log_rotate();
 int mxs_log_enable_priority(int priority);
 int mxs_log_disable_priority(int priority);
 
-bool skygw_logmanager_init(const char* logdir, log_target_t target, int argc, char* argv[]);
+bool skygw_logmanager_init(const char* ident,
+                           const char* logdir,
+                           log_target_t target,
+                           int argc, char* argv[]);
 void skygw_logmanager_done(void);
 void skygw_logmanager_exit(void);