hotfix(core) run shms check in early init phase

Some shms, and especially the `kong` one might be used inside of the
global patches (or in any of the other modules we require for that is).

This bug was caught on the CI environment with OpenResty 1.11.2.1, which
calls `math.randomseed()` inside of its main chunk from the
lua-resty-dns library, which triggers our custom
`globalpatches.randomseed` behavior, which needs the `kong` shm.

kong/kong.lua

@@ -24,6 +24,22 @@
 -- |[[    ]]|
 -- ==========
 
+do
+  -- let's ensure the required shared dictionaries are
+  -- declared via lua_shared_dict in the Nginx conf
+
+  local constants = require "kong.constants"
+
+  for _, dict in ipairs(constants.DICTS) do
+    if not ngx.shared[dict] then
+      return error("missing shared dict '" .. dict .. "' in Nginx "          ..
+                   "configuration, are you using a custom template? "        ..
+                   "Make sure the 'lua_shared_dict " .. dict .. " [SIZE];' " ..
+                   "directive is defined.")
+    end
+  end
+end
+
 require("kong.core.globalpatches")()
 
 local dns = require "kong.tools.dns"
@@ -121,17 +137,6 @@ end
 local Kong = {}
 
 function Kong.init()
-  -- let's ensure the required shared dictionaries are
-  -- declared via lua_shared_dict in the Nginx conf
-  for _, dict in ipairs(constants.DICTS) do
-    if not ngx.shared[dict] then
-      return error("missing shared dict '" .. dict .. "' in Nginx "          ..
-                   "configuration, are you using a custom template? "        ..
-                   "Make sure the 'lua_shared_dict " .. dict .. " [SIZE];' " ..
-                   "directive is defined.")
-    end
-  end
-
   local pl_path = require "pl.path"
   local conf_loader = require "kong.conf_loader"