scripts: Add get_maintainer.pl

While we adopted the MAINTAINERS file in kvm-unit-tests, the tool to
determine who to CC on patch submissions is still missing.

Copy Linux's version over and adjust i

scripts: Add get_maintainer.pl

While we adopted the MAINTAINERS file in kvm-unit-tests, the tool to
determine who to CC on patch submissions is still missing.

Copy Linux's version over and adjust it to work with and call out the
kvm-unit-tests tree.

Signed-off-by: Alexander Graf <graf@amazon.com>
Message-Id: <20210923112933.20476-1-graf@amazon.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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