* WIP
* Fixed ARP, with 2 test cases pending which requires src changes which are not priority. Fixed TCP and UDP test cases.
* return value of xProcessReceivedUDPPacket initialized to pdFAIL
* WIP fix failing test cases
* Fixed failing tests for UDP IP unit tests
* Fixed unit tests failures after combining v4 specific source with main udp ip source
* Removing unused code
This commit brings in the refactoring and restructuring changes
from IntegrationTesting1 branch to the main branch.
It also includes additional unit tests for 100% coverage.
The rationale behind not creating a PR is that the conflicts were too
huge to be resolved correctly. Thus, a force push to the main branch is
being done.