Validate component usage (#23037)

* Update manifest validator

* Update circle

* Update text

* Typo

* fix link to codeowners

* Merge CODEOWNERS into hassfest

* Annotate errors with fixable

* Convert error to warning

* Lint

* Make abs path

* Python 3.5...

* Typo

* Fix tests

script/gen_requirements_all.py

@@ -3,11 +3,12 @@
 import fnmatch
 import importlib
 import os
+import pathlib
 import pkgutil
 import re
 import sys
 
-from script.manifest.requirements import gather_requirements_from_manifests
+from script.hassfest.model import Integration
 
 COMMENT_REQUIREMENTS = (
     'Adafruit-DHT',
@@ -219,7 +220,7 @@ def gather_modules():
 
     errors = []
 
-    gather_requirements_from_manifests(process_requirements, errors, reqs)
+    gather_requirements_from_manifests(errors, reqs)
     gather_requirements_from_modules(errors, reqs)
 
     for key in reqs:
@@ -235,6 +236,28 @@ def gather_modules():
     return reqs
 
 
+def gather_requirements_from_manifests(errors, reqs):
+    """Gather all of the requirements from manifests."""
+    integrations = Integration.load_dir(pathlib.Path(
+        'homeassistant/components'
+    ))
+    for domain in sorted(integrations):
+        integration = integrations[domain]
+
+        if not integration.manifest:
+            errors.append(
+                'The manifest for component {} is invalid.'.format(domain)
+            )
+            continue
+
+        process_requirements(
+            errors,
+            integration.manifest['requirements'],
+            'homeassistant.components.{}'.format(domain),
+            reqs
+        )
+
+
 def gather_requirements_from_modules(errors, reqs):
     """Collect the requirements from the modules directly."""
     for package in sorted(