During shutdown sigterm is send to all processes every second

First time is triggers some shutdown mechanisms in a patroni, but the
second one just terminates patroni. Solution is pretty simple, we need
to ignore all other sigterms which are coming after the first one.

patroni/__init__.py

@@ -126,6 +126,7 @@ def main():
     except KeyboardInterrupt:
         pass
     finally:
+        patroni.api.shutdown()
         patroni.touch_member(patroni.shutdown_member_ttl)  # schedule member removal
         patroni.postgresql.stop()
         patroni.ha.dcs.delete_leader()

patroni/utils.py

@@ -46,6 +46,7 @@ def calculate_ttl(expiration):
 
 
 def sigterm_handler(signo, stack_frame):
+    signal.signal(signal.SIGTERM, signal.SIG_IGN)
     sys.exit()
 
 

tests/test_patroni.py

@@ -40,6 +40,9 @@ def keyboard_interrupt(*args):
 
 class Mock_BaseServer__is_shut_down:
 
+    def wait(self):
+        pass
+
     def set(self):
         pass