journald logs: simplify entry parsing

It makes little sense to create a log line string from the entry just to
parse it again into a LogLine. We have the typed fields so we can
assemble the logLine direclty, this makes things simpler and more
efficient.

Also entries from the passthrough driver do not use the CONTAINER_ID_FULL
field, instead we can just access c.ID() directly.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

test/system/250-systemd.bats

@@ -428,6 +428,12 @@ EOF
 $name stderr" "logs work with passthrough"
     done
 
+    # we cannot assume the ordering between a b, this depends on timing and would flake in CI
+    # use --names so we do not have to get the ID
+    run_podman pod logs --names test_pod
+    assert "$output" =~ ".*^test_pod-a a stdout.*" "logs from container a shown"
+    assert "$output" =~ ".*^test_pod-b b stdout.*" "logs from container b shown"
+
     # Add a simple `auto-update --dry-run` test here to avoid too much redundancy
     # with 255-auto-update.bats
     run_podman auto-update --dry-run --format "{{.Unit}},{{.Container}},{{.Image}},{{.Updated}},{{.Policy}}"