Controller: sync resources also to namespaces

Using reduced syncing and MachineAPI.sync_resources() shows that the
resources are properly synced however not available for commands or
test modules run in specific netns. This patch extends resource syncing
to slavemachine's configured namespaces.

I had to add netns parameter to copy_file_to_machine method, too.
Copying the same file to slave machine is not the most efficient
approach, however it fixes the issue until better approach is found.

Signed-off-by: Jan Tluka <jtluka@redhat.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>