Enable kernel.unprivileged_userns_clone to see if that fixes bpf buil… #2830

Job	Run time
env-protect-setup	5s
authorize	4s
get-dev-image / get-image	7s
clang-tidy	1m 6s
code-coverage	9m 17s
generate-matrix	3m 22s
build-and-test	0s
build-and-test-status	2s
generate-matrix	3m 3s
env-protect-setup	5s
get-dev-image / get-image	7s
code-coverage	9m 17s
clang-tidy	1m 6s
authorize	4s
build-and-test (BPF opt (4.14.254), kvm, --config=qemu-bpf --compilation_mode=opt --//bazel/test_...	2m 49s
build-and-test (ASAN, nokvm, --config=asan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	3m 31s
build-and-test (Go race detector, nokvm, --config=go_race --compilation_mode=opt, bazel_buildable...	2m 58s
build-and-test (BPF opt (6.1.106), kvm, --config=qemu-bpf --compilation_mode=opt --//bazel/test_r...	2m 40s
build-and-test (TSAN, nokvm, --config=tsan --compilation_mode=dbg, bazel_buildables_sanitizer, ba...	3m 18s
build-and-test (GCC opt, nokvm, --config=gcc --compilation_mode=opt, bazel_buildables_gcc_opt, ba...	3m 9s
build-and-test (Clang opt + UI, nokvm, --config=clang --compilation_mode=opt, bazel_buildables_cl...	4m 2s
build-and-test (Clang debug, nokvm, --config=clang --compilation_mode=dbg, bazel_buildables_clang...	3m 12s
build-and-test-status	3s
	53m 27s

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