get_ci_vm.sh: Fix conflicting homedir files

Previously, the script would bind mount the user's home directory into
the container in order to execute gcloud commands.  This was done
to preserve the `.config/gcloud` directory and new ssh keys in `.ssh`.
However, it's possible the user has modified `.bash*` or `.ssh/config`
files which do not play nicely with gcloud and/or the container.

Fix this by mounting the existing temporary directory on the host, as
the user's home directory.  Then bind mount in a dedicated `gcloud/ssh`
sub-directory, and the libpod repo directory on top.  Pre-create the
necessary mount-points as the user, so later removal does not require
root on the host.

The gcloud tool takes minutes to setup/manage its ssh-keys, so preserving
that work between runs is a necessary optimization.  Similarly, saving the
`.gcloud` directory prevents repeatedly going through the lengthy
client-auth process.

Overall, these changes make the container environment much more selective
with the host-side data it has access to use/modify.  Preventing unrelated
details from getting in the way, and preserving only the bare-minimum of
details on the host, between runs.

Signed-off-by: Chris Evich <cevich@redhat.com>

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