routes: Skip network restart on 'noifupdown'

Previously, setting up routes did not allow passing 'require_reboot',
so each route change would lead to a networking service restart,
rendering interface configuration options like 'noifupdown' useless.
Allow disabling network restart per-interface using the existing
'noifupdown' option.

Signed-off-by: Alexandru Avadanii <Alexandru.Avadanii@enea.com>

linux/network/interface.sls

       gateway: {{ route.gateway }}
       {%- endif %}
     {%- endfor %}
+  {%- if interface.noifupdown is defined %}
+  - require_reboot: {{ interface.noifupdown }}
+  {%- endif %}
 
 {%- endif %}