Update setup_env_ubuntu.sh to use configure-hypervisor.sh script

[jodh-intel]

⚠️ IMPOTANT: This issue should not be actioned until clearcontainers/packaging#46 has landed (post beta).

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We need to change setup_env_ubuntu.sh so that rather than hard-coding the hypervisor options, it instead runs the script below to generate the correct build options:

• https://github.com/clearcontainers/packaging/blob/master/scripts/configure-hypervisor.sh

To avoid all repos that go get github.com/clearcontainers/tests from also having to go get github.com/clearcontainers/packaging, setup_env_ubuntu.sh should be modified to just download the script itself:

curl -LO https://raw.githubusercontent.com/clearcontainers/packaging/master/scripts/configure-hypervisor.sh

See clearcontainers/packaging#46

[sboeuf]

But we don't want to build/install qemu binary from sources, this was temporary, right ? The idea is to update the packages and our test scripts rely on qemu-lite or qemu-cc packages.