redis: Lower some default values

This avoids a warning on startup.

packages/redis/lower-default-values.patch

@@ -0,0 +1,55 @@
+Avoid warnings on startup due to trying to set too high maxclients
+and tcp-backlog.
+
+Values observed on a Xperia Z4 Tablet running Android 7.0.
+diff -u -r ../redis-3.2.8/redis.conf ./redis.conf
+--- ../redis-3.2.8/redis.conf	2017-02-12 16:14:57.000000000 +0100
++++ ./redis.conf	2017-03-07 14:38:42.825991097 +0100
+@@ -90,7 +90,7 @@
+ # will silently truncate it to the value of /proc/sys/net/core/somaxconn so
+ # make sure to raise both the value of somaxconn and tcp_max_syn_backlog
+ # in order to get the desired effect.
+-tcp-backlog 511
++tcp-backlog 128
+ 
+ # Unix socket.
+ #
+@@ -501,7 +501,7 @@
+ ################################### LIMITS ####################################
+ 
+ # Set the max number of connected clients at the same time. By default
+-# this limit is set to 10000 clients, however if the Redis server is not
++# this limit is set to 4000 clients, however if the Redis server is not
+ # able to configure the process file limit to allow for the specified limit
+ # the max number of allowed clients is set to the current file limit
+ # minus 32 (as Redis reserves a few file descriptors for internal uses).
+@@ -509,7 +509,7 @@
+ # Once the limit is reached Redis will close all the new connections sending
+ # an error 'max number of clients reached'.
+ #
+-# maxclients 10000
++# maxclients 4000
+ 
+ # Don't use more memory than the specified amount of bytes.
+ # When the memory limit is reached Redis will try to remove keys
+diff -u -r ../redis-3.2.8/src/server.h ./src/server.h
+--- ../redis-3.2.8/src/server.h	2017-02-12 16:14:57.000000000 +0100
++++ ./src/server.h	2017-03-07 14:38:53.357859408 +0100
+@@ -79,7 +79,7 @@
+ #define CONFIG_MIN_HZ            1
+ #define CONFIG_MAX_HZ            500
+ #define CONFIG_DEFAULT_SERVER_PORT        6379    /* TCP port */
+-#define CONFIG_DEFAULT_TCP_BACKLOG       511     /* TCP listen backlog */
++#define CONFIG_DEFAULT_TCP_BACKLOG       128     /* TCP listen backlog */
+ #define CONFIG_DEFAULT_CLIENT_TIMEOUT       0       /* default client timeout: infinite */
+ #define CONFIG_DEFAULT_DBNUM     16
+ #define CONFIG_MAX_LINE    1024
+@@ -94,7 +94,7 @@
+ #define AOF_REWRITE_ITEMS_PER_CMD 64
+ #define CONFIG_DEFAULT_SLOWLOG_LOG_SLOWER_THAN 10000
+ #define CONFIG_DEFAULT_SLOWLOG_MAX_LEN 128
+-#define CONFIG_DEFAULT_MAX_CLIENTS 10000
++#define CONFIG_DEFAULT_MAX_CLIENTS 4000
+ #define CONFIG_AUTHPASS_MAX_LEN 512
+ #define CONFIG_DEFAULT_SLAVE_PRIORITY 100
+ #define CONFIG_DEFAULT_REPL_TIMEOUT 60