[cli] Fix backend initialization

Previously, the init command had a '-b' flag. This only initialized a
local backend but the description on the flag stated 'useful for
refreshing a pre-existing deployment'. This flag now actually reflects
this

Signed-off-by: jack1902 <39212456+jack1902@users.noreply.github.com>

streamalert_cli/terraform/handlers.py

@@ -64,7 +64,7 @@ def handler(cls, options, config):
 
         # Stop here if only initializing the backend
         if options.backend:
-            return cls._terraform_init_backend()
+            return cls._terraform_init_backend(config)
 
         LOGGER.info('Initializing StreamAlert')
 
@@ -113,7 +113,7 @@ def handler(cls, options, config):
         return tf_runner(refresh=False)
 
     @staticmethod
-    def _terraform_init_backend():
+    def _terraform_init_backend(config):
         """Initialize the infrastructure backend (S3) using Terraform
 
         Returns:
@@ -127,6 +127,10 @@ def _terraform_init_backend():
         if not terraform_check():
             return False
 
+        # See generate_main() for how it uses the `init` kwarg for the local/remote backend
+        if not terraform_generate_handler(config=config, init=False):
+            return False
+
         LOGGER.info('Initializing StreamAlert backend')
         return run_command(['terraform', 'init'])