Add missing OPTIONAL_API and ARI dependences.

I've audited all modules that include any header which includes
asterisk/optional_api.h.  All modules which use OPTIONAL_API now declare
those dependencies in AST_MODULE_INFO using requires or optional_modules
as appropriate.

In addition ARI dependency declarations have been reworked.  Instead of
declaring additional required modules in res/ari/resource_*.c we now add
them to an optional array "requiresModules" in api-docs for each module.
This allows the AST_MODULE_INFO dependencies to include those missing
modules.

Change-Id: Ia0c70571f5566784f63605e78e1ceccb4f79c606

rest-api-templates/res_ari_resource.c.mustache

@@ -40,6 +40,9 @@
 	<depend type="module">res_ari</depend>
 	<depend type="module">res_ari_model</depend>
 	<depend type="module">res_stasis</depend>
+{{#requires_modules}}
+	<depend type="module">{{.}}</depend>
+{{/requires_modules}}
 	<support_level>core</support_level>
  ***/
 
@@ -324,6 +327,6 @@ AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_DEFAULT, "RESTful API module - {{{
 	.support_level = AST_MODULE_SUPPORT_CORE,
 	.load = load_module,
 	.unload = unload_module,
-	.requires = "res_ari,res_ari_model,res_stasis",
+	.requires = "res_ari,res_ari_model,res_stasis{{#requires_modules}},{{.}}{{/requires_modules}}",
 );
 {{/api_declaration}}

rest-api-templates/swagger_model.py

@@ -647,6 +647,7 @@ class ApiDeclaration(Stringify):
         self.api_version = api_decl_json.get('apiVersion')
         self.base_path = api_decl_json.get('basePath')
         self.resource_path = api_decl_json.get('resourcePath')
+        self.requires_modules = api_decl_json.get('requiresModules') or []
         api_json = api_decl_json.get('apis') or []
         self.apis = [
             Api().load(j, processor, context) for j in api_json]