Setup signal handler before creating dcs

Otherwise it was swallowing SysExit exception in an infinite loop.

patroni/__init__.py

@@ -18,6 +18,8 @@
 class Patroni(object):
 
     def __init__(self):
+        self.setup_signal_handlers()
+
         self.version = __version__
         self.config = Config()
         self.dcs = get_dcs(self.config)
@@ -31,10 +33,6 @@ def __init__(self):
         self.nap_time = self.config['loop_wait']
         self.next_run = time.time()
 
-        self._reload_config_scheduled = False
-        self._received_sighup = False
-        self._received_sigterm = False
-
     def load_dynamic_configuration(self):
         while True:
             try:
@@ -114,6 +112,8 @@ def run(self):
             self.schedule_next_run()
 
     def setup_signal_handlers(self):
+        self._received_sighup = False
+        self._received_sigterm = False
         signal.signal(signal.SIGHUP, self.sighup_handler)
         signal.signal(signal.SIGTERM, self.sigterm_handler)
         signal.signal(signal.SIGCHLD, sigchld_handler)
@@ -124,7 +124,6 @@ def main():
     logging.getLogger('requests').setLevel(logging.WARNING)
 
     patroni = Patroni()
-    patroni.setup_signal_handlers()
     try:
         patroni.run()
     except KeyboardInterrupt: