kola/tests/docker: Test no-new-privileges security option

[pothos]

Extend the Docker option test with two --security-opt cases where
one currently broke in Alpha 2492.0.0. See
flatcar/Flatcar#110

How to use

$ make
$ cd bin
$ wget https://alpha.release.flatcar-linux.net/amd64-usr/2492.0.0/flatcar_production_qemu_image.img.bz2
$ (l)bunzip2 flatcar_production_qemu_image.img.bz2
$ sudo ./kola run --qemu-image flatcar_production_qemu_image.img --qemu-skip-mangle docker.base

Result for Alpha as above (WARNING can be ignored):

=== RUN   docker.base
=== RUN   docker.base/docker-info
=== RUN   docker.base/resources
=== RUN   docker.base/networks-reliably
=== RUN   docker.base/user-no-caps
--- FAIL: docker.base (221.02s)
    --- PASS: docker.base/docker-info (0.57s)
    --- FAIL: docker.base/resources (49.74s)
            cluster.go:117: WARNING: Your kernel does not support Block I/O weight or the cgroup is not mounted. Weight discarded.
            cluster.go:117: standard_init_linux.go:211: exec user process caused "operation not permitted"
            docker.go:305: [0] failed to run "docker run --rm --security-opt=no-new-privileges sleep sleep 0.2": output: "" status: "Process exited with status 1"
    --- PASS: docker.base/networks-reliably (150.68s)
    --- PASS: docker.base/user-no-caps (0.92s)
FAIL, output in _kola_temp/qemu-2020-05-05-1224-231131
harness: test suite failed

[t-lo]

Works as advertised (I've also checked alpha-2466.0.0, which passes the test). Thanks!