The new `grep` function reads a specified file and returns lines
containing a given pattern. It handles file not found errors and logs
unexpected exceptions, improving resilience in file operations.
Introduced a `DbusInterface` base class with a `cleanup` method to
standardize resource cleanup for D-Bus interfaces. Modified
`InterfacePiControl` to inherit from it and implemented `cleanup` logic
for proper watchdog resource handling. Adjusted `BusProvider` to manage
multiple interfaces and ensure cleanup on shutdown.
The ResetDriverWatchdog class was relocated from dbus_helper.py to a new
helper module, process_image_helper.py, to improve code organization
and maintainability. Updated imports in relevant files to reflect this
change.
Consolidated `REVPI_DBUS_*` constants and `extend_interface` function
into `dbus_helper.py` for better modularity and reusability. Updated
imports across modules to reflect this change.
