[Bug 2069127] Re: net:unicast_extensions.sh complains about missing lib.sh

Fix sent to stable 6.6
https://lore.kernel.org/stable/20240614065820.865974-1-po-hsu.lin@canonical.com/T/#t

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https://bugs.launchpad.net/bugs/2069127

Title:
net:unicast_extensions.sh complains about missing lib.sh

Status in ubuntu-kernel-tests:
New
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Mantic:
Confirmed

Bug description:
Issue found on Mantic 6.5.0-44.44 in cycle 2024.06.10

Running 'make run_tests -C net TEST_PROGS=unicast_extensions.sh TEST_GEN_PROGS='' TEST_CUSTOM_PROGS='''
make: Entering directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'
TAP version 13
1..1
# timeout set to 0
# selftests: net: unicast_extensions.sh
# ./unicast_extensions.sh: line 31: lib.sh: No such file or directory
# ###########################################################################
# Unicast address extensions tests (behavior of reserved IPv4 addresses)
# ###########################################################################
# TEST: assign and ping within 240/4 (1 of 2) (is allowed) [FAIL]
# TEST: assign and ping within 240/4 (2 of 2) (is allowed) [FAIL]
# TEST: assign and ping within 0/8 (1 of 2) (is allowed) [FAIL]
# TEST: assign and ping within 0/8 (2 of 2) (is allowed) [FAIL]
# TEST: assign and ping inside 255.255/16 (is allowed) [FAIL]
# TEST: assign and ping inside 255.255.255/24 (is allowed) [FAIL]
# TEST: route between 240.5.6/24 and 255.1.2/24 (is allowed) [FAIL]
# TEST: route between 0.200/16 and 245.99/16 (is allowed) [FAIL]
# TEST: assign and ping lowest address (/24) [FAIL]
# TEST: assign and ping lowest address (/26) [FAIL]
# TEST: routing using lowest address [FAIL]
# TEST: assigning 0.0.0.0 (is forbidden) [ OK ]
# TEST: assigning 255.255.255.255 (is forbidden) [ OK ]
# TEST: assign and ping inside 127/8 (is forbidden) [ OK ]
# TEST: assign and ping class D address (is forbidden) [ OK ]
# TEST: routing using class D (is forbidden) [ OK ]
# TEST: routing using 127/8 (is forbidden) [ OK ]
not ok 1 selftests: net: unicast_extensions.sh # exit=1
make: Leaving directory '/home/ubuntu/autotest/client/tmp/ubuntu_kselftests_net/src/linux/tools/testing/selftests/net'

This is because of the stable update bug 2059991 pulls in commit
0f4765d0b4 "selftests/net: convert unicast_extensions.sh to run it in
unique name space", which adds a dependency of a share library
"lib.sh". And we don't have that commit for adding lib.sh to our
kernel.

Since this will be the last cycle of Mantic kernel, we will leave it
as-is.

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