Same pattern as framework_helpers: both modules imported requests at module
top level but only use it inside functions that perform actual network I/O
(downloading fonts/images, web_server OTA upload), never during config
validation. external_files is loaded by the font and audio_file components.
Defer the imports into the functions that use them, and update the tests to
patch requests.<method> directly (the modules no longer hold a requests
attribute). Adds regression tests guarding against re-introducing the
top-level imports.
Franck Nijhof
19280e03ad