Attach to a container's log_stream before they're started

So we're not displaying output of all previous logs for a container, we attach,
if possible, to a container before the container is started.

LogPrinter checks if a container has a log_stream already attached and
print from that rather than always attempting to attach one itself.

Signed-off-by: Mazz Mosley <mazz@houseofmnowster.com>

compose/project.py

@@ -290,7 +290,8 @@ class Project(object):
            start_deps=True,
            strategy=ConvergenceStrategy.changed,
            do_build=True,
-           timeout=DEFAULT_TIMEOUT):
+           timeout=DEFAULT_TIMEOUT,
+           detached=False):
 
         services = self.get_services(service_names, include_deps=start_deps)
 
@@ -308,7 +309,8 @@ class Project(object):
             for container in service.execute_convergence_plan(
                 plans[service.name],
                 do_build=do_build,
-                timeout=timeout
+                timeout=timeout,
+                detached=detached
             )
         ]