Updates based on feedback

Simplify checks for file exists

remove invalid char

Review feedback. Use regular systemd file.

Add template for docker systemd atomic

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>

kubelet lost the ability to load kernel modules.  This
puts that back by adding the lib/modules mount to kubelet.

The new variable kubelet_load_modules can be set to true
to enable this item.  It is OFF by default.

Signed-off-by: Bogdan Dobrelya <bogdando@mail.ru>