[weblate] Allow installation of extra packages with dep update script

scripts/weblate/README.md

@@ -44,7 +44,11 @@ entries:
 
     'skip': A list of packages to be skipped.
 
-    'require_pip': A list of packages that must be installed with pip.
+    'require_pip': A list of packages that must be installed from pip if they
+                   appear somewhere in the dependency tree.
+
+    'extra_pip': A list of extra packages to be installed from pip regardless
+                 of being dependencies of other packages.
 
     'require_debian': A list of packages that must be installed from Debian.
 

scripts/weblate/update_puppet_dependency_files.py

@@ -365,6 +365,7 @@ def main():
     debian_needs = set(config.get('require_debian'))
 
     deps = [Dependency(i, config['pip']) for i in output.getvalue().decode().splitlines()]
+    deps += [Dependency(i, config['pip']) for i in config.get('extras_pip', [])]
 
     def in_debian(dep):
         try: