redis: Fix wrong type used to parse socket_keepalive

The socket_keepalive option in RedisClient is not an integer but
a boolean. This fixes the type to parse the options accordingly.

Note this change still keeps support for socket_keepalive=1 or
socket_keepalive=0 , but would remove support for the other integer
values such as 2 or -1.

Change-Id: I47b8628b9676f37ab5bb82b0fa9e45fcff679893

releasenotes/notes/fix-redis-socket_keepalive-type-32b41b746f426efb.yaml

@@ -0,0 +1,9 @@
+---
+upgrade:
+  - |
+    The ``socket_keepalive`` option of redis driver no longer accepts integers
+    other than 0 and 1.
+
+fixes:
+  - |
+    The ``socket_keepalive`` option of redis driver now accepts boolean values.

tooz/drivers/redis.py

@@ -285,13 +285,13 @@ class RedisDriver(coordination.CoordinationDriverCachedRunWatchers,
     #: Client arguments that are expected to be boolean convertible.
     CLIENT_BOOL_ARGS = frozenset([
         'retry_on_timeout',
+        'socket_keepalive',
         'ssl',
     ])
 
     #: Client arguments that are expected to be int convertible.
     CLIENT_INT_ARGS = frozenset([
         'db',
-        'socket_keepalive',
     ])
 
     #: Client arguments that are expected to be float convertible.