docker: fixup redepends and clean rsuggests

With the 5.0 kernel and docker 18.09 you can run into issues
pulling from docker hub due to an invalid/unknown certificate.
We fix that by adding ca-certifcates as a runtime dependency.

There can also be isuses setting up the network bridge, so we
add bridge-utils to the rdepends.

We also add some comments about this recipe and how it should
be updated using moby (and why it is like it is).

Finally, no one wants rt-tests and lxc when installing docker,
so we drop them from the rsuggests.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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