[BUG] nginx configuration file without a value gets clobbered

[ThePrez]

Describe the bug When SC rewrites the nginx configuration file in cluster mode (cluster.conf), it does not handle directives that don't take a value.

This was discovered when testing the nginx stub status module

To Reproduce

• Create an application and service definition that runs in cluster mode
• Modify the cluster.conf file with a non-value directive
• start the service

Expected behavior

• Service starts without issue

Additional context When sc rewrites the cluster.conf file (to ensure the proper upstream ports are in place) it doesn't properly handle the value-less directive. Instead, it will rewrite the line

stub_status:

to

stub_status stub_status:

[ThePrez]

Fixed by #185