Track include and TLS certs with Reloader

[samuelattwood]

• Adds logic to recursively find any includes and certs in the NATS config and add them to the file watcher
• Dependency updates

[caleblloyd]

I know this is old code, but is there an opportunity to update this to /etc/nats-config/nats.conf?

[samuelattwood]

I only left it in the event that someone is still using that default, but that's probably pretty unlikely at this point so we can change it if no one has concerns.

[caleblloyd]

While we are on the subject of regex, I guess we should techncially unit test that the regex handles all of these cases. Can you think of any others?

This is just for the include, but we'd need something similar for TLS certs too

include nats.conf
include nats.conf;    // semicolon terminated
include "nats.conf"   // quoted
include "nats.conf";  // quoted and semicolon terminated
include 'nats.conf'   // are single quotes valid in nats conf?  if so also need this
include 'nats.conf';  // are single quotes valid in nats conf?  if so also need this
include $NATS;        // ignore, this is a variable.  let's not worry about variable interpolation
include "$NATS.conf"  // don't ignore, this is a string not a variable

[samuelattwood]

Golang regex doesn't support negative lookaheads, but I updated the code to handle includes with $ and updated the test to verify these cases

[wallyqs]

LGTM