system tests: new test for run --log-driver

Tests all (current) values for --log-driver=X, and one test
for invalid value. For those drivers that write a local
file (json-file, k8s-file), test that the file exists and
contains results of the expected form (timestamp, stdout,
'F' for 'F'ull line, and the expected string output.

For json-file, confirm that podman issues a "Choosing k8s-file"
warning (only on local. On podman-remote, the warning goes only
to the server's stderr).

Written in response to #7754 in which driver=json-file was
falling through to 'none' instead of 'k8s-file'.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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