Force redis::ulimit to be an integer

The upstream change at:
502ff38c8c

made redis::ulimit an integer and will now error out if passed a string.
Historically in THT we passed RedisFDLimit directly to the redis::ulimit
hiera key as a string. Let's just change RedisFDLimit to a number. The
only affected people will be those that A) tweaked this parameter and
B) actually wrapped the param into quotes so to force it as a string.
Given that this number is likely non-significance, we choose this route
and we avoid an extra YAQL invocation to do a conversion in THT.

Change-Id: I70361801c71738f2d95930aea99914316d9f0d11
Closes-Bug: #1854136
(cherry picked from commit b82725f5e0)

deployment/database/redis-base-puppet.yaml

@@ -10,7 +10,7 @@ parameters:
     hidden: true
   RedisFDLimit:
     description: Configure Redis FD limit
-    type: string
+    type: number
     default: 10240
   ServiceData:
     default: {}