Fix > 9 PostgreSQL version numbering

patroni/postgresql.py

@@ -981,7 +981,7 @@ $$""".format(name, ' '.join(options)), name, password, password)
         >>> Postgresql.postgres_version_to_int('9.3.13')
         90313
         >>> Postgresql.postgres_version_to_int('10.1')
-        100100
+        100001
         >>> Postgresql.postgres_version_to_int('10')
         Traceback (most recent call last):
             ...
@@ -997,8 +997,8 @@ $$""".format(name, ' '.join(options)), name, password, password)
         if len(components) < 2 or len(components) > 3:
             raise Exception("Invalid PostgreSQL format: X.Y or X.Y.Z is accepted: {0}".format(pg_version))
         if len(components) == 2:
-            # new style verion numbers, i.e. 10.1
-            components.append('0')
+            # new style verion numbers, i.e. 10.1 becomes 100001
+            components.insert(1, '0')
         try:
             result = [c if int(c) > 10 else '0{0}'.format(c) for c in components]
             result = int(''.join(result))