[FS#75] udhcpc duplicate session and high cpu usage on wrong interface

[LEDE Bugs]

The following task has been changed.  The changes are listed below.  For full information about what has changed, visit the URL and click the History tab.

FS#75 - udhcpc duplicate session and high cpu usage on wrong interface
User who did this: john (john)
Assigned To: [-] -> Felix Fietkau

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=75