[no-relnote] Add test for libcuda lookup

This change adds a test for locating libcuda as a driver library.
This includes a failing test on a system where libcuda.so.1 is in
the ldcache, but not at one of the predefined library search paths.

A testdata folder with sample root filesystems is included to test
various combinations.

Signed-off-by: Evan Lezar <elezar@nvidia.com>

testdata/lookup/rootfs-1/README.md

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+This rootfs represents a host with the CUDA driver libraries installed in
+/lib/x86_64-linux-gnu. The included /etc/ld.so.cache was copied from such as system.

testdata/lookup/rootfs-1/lib/x86_64-linux-gnu/libcuda.so.1

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+libcuda.so.999.88.77

testdata/lookup/rootfs-2/README.md

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+This rootfs represents a host with the CUDA driver libraries installed in
+/var/lib/nvidia/lib64. The included /etc/ld.so.cache was generated in a container
+simulating such as system.

testdata/lookup/rootfs-2/var/lib/nvidia/lib64/libcuda.so.1

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+libcuda.so.999.88.77

testdata/lookup/rootfs-empty/README.md

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+The folders represents an empty rootfs.

testdata/lookup/rootfs-no-cache-lib64/usr/lib64/libcuda.so.1

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+libcuda.so.999.88.77