[mcast, p4] drop mcast pkts coming from the userspace service port - #415

control: job assigned to worker 01M6QQXHZN7Y8GA59GGMKQ809X [factory aws, i-083e10c8df2f1f3bb] (queued for 29 s)
...
task: starting task 0: "setup"
task: process exited: duration 19080 ms, exit code 0
...
task: starting task 1: "rust-toolchain"
task: process exited: duration 8028 ms, exit code 0
...
task: starting task 2: "authentication"
task: process exited: duration 7 ms, exit code 0
...
task: starting task 3: "clone repository"
task: process exited: duration 1240 ms, exit code 0
...
task: starting task 4: "build"
...
|    #
|   # #    #####    #####     #    ######    ##     ####    #####   ####
|  #   #   #    #     #       #    #        #  #   #    #     #    #
| #     #  #    #     #       #    #####   #    #  #          #     ####
| #######  #####      #       #    #       ######  #          #         #
| #     #  #   #      #       #    #       #    #  #    #     #    #    #
| #     #  #    #     #       #    #       #    #   ####      #     ####
| 
| + sudo mkdir -p /out
| + sudo chown 12345 /out
task: process exited: duration 236725 ms, exit code 0
|W| found 4 output files
|W| uploading: /work/swadm (11626768 bytes)
|W| uploaded: /work/swadm
|W| uploading: /work/swadm.sha256.txt (65 bytes)
|W| uploaded: /work/swadm.sha256.txt
|W| uploading: /work/dpd (22369864 bytes)
|W| uploaded: /work/dpd
|W| uploading: /work/dpd.sha256.txt (65 bytes)
|W| uploaded: /work/dpd.sha256.txt