iproute2 (kernel 5.6) extended for SRv6 uSID support

The patch to iproute2 for SRv6 uSID is in the srv6-usid-public branch.

The patch can be found in the following commit:

• Add support for SRv6 uN behavior

See the commit message for details.

The affected iproute2 version is:

# ip -V
ip utility, iproute2-ss200330

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