feat: create redisha module

- manage redis/sentinel clusters
- ensure ulimit_managed is false
- dynamically find servers in role to identify master
- add redisadm and sentineladm commands
- add script to check if the current host in the master

modules/redisha/templates/check_redis_master.erb

@@ -0,0 +1,2 @@
+#!/usr/bin/bash
+sudo /usr/local/sbin/sentineladm info | grep -q <%= @facts['networking']['fqdn'] %>

modules/redisha/templates/redisadm.erb

@@ -0,0 +1,9 @@
+#!/usr/bin/bash
+REDIS_HOST=<%= @redis_host %>
+REDIS_PORT=<%= @redis_port %>
+
+if [ $# -gt 0 ]; then
+    REDISCLI_AUTH=<%= @requirepass %> redis-cli -h "$REDIS_HOST" -p "$REDIS_PORT" "$@"
+else
+    REDISCLI_AUTH=<%= @requirepass %> redis-cli -h "$REDIS_HOST" -p "$REDIS_PORT"
+fi

modules/redisha/templates/sentineladm.erb

@@ -0,0 +1,9 @@
+#!/usr/bin/bash
+REDIS_HOST=<%= @redis_host %>
+SENTINEL_PORT=<%= @sentinel_port %>
+
+if [ $# -gt 0 ]; then
+    REDISCLI_AUTH=<%= @requirepass %> redis-cli -h "$REDIS_HOST" -p "$SENTINEL_PORT" "$@"
+else
+    REDISCLI_AUTH=<%= @requirepass %> redis-cli -h "$REDIS_HOST" -p "$SENTINEL_PORT"
+fi