Print the current sync time along with the watcher's output

[tiagopog]

Use case: when I'm not sure whether the last change synced properly I usually check the docker-sync log in order to see what actually happened, but it turns out that having no time reference doesn't help that much:

$ docker-sync logs -f
...
     success  Starting to watch /Users/tiagopog/Dev/ruby/my_awesome_project - Press CTRL-C to stop
Sync web-sync            ok  Synced /Users/tiagopog/Dev/ruby/my_awesome_project
Sync web-sync            ok  Synced /Users/tiagopog/Dev/ruby/my_awesome_project
Sync web-sync            ok  Synced /Users/tiagopog/Dev/ruby/my_awesome_project

Now prepending the sync time in the output string makes really easier to figure out whether something was synced:

$ docker-sync logs -f
...
     success  Starting to watch /Users/tiagopog/Dev/ruby/my_awesome_project - Press CTRL-C to stop
[2017-07-02 03:44:04 -0300] Sync web-sync            ok  Synced /Users/tiagopog/Dev/ruby/my_awesome_project
[2017-07-02 03:45:15 -0300] Sync web-sync            ok  Synced /Users/tiagopog/Dev/ruby/my_awesome_project
[2017-07-02 03:47:21 -0300] Sync web-sync            ok  Synced /Users/tiagopog/Dev/ruby/my_awesome_project

I hope this is helpful and thanks for this awesome project.

[EugenMayer]

Makes a lot of sense, iam on Holliday and If nobody reviewed it until then I am happy to do so an merge it!

Thank you for the contribution!

[tiagopog]

Nice to know, @EugenMayer. Shall it be merged then? I've been using the fork of docker-sync for the past 3 days and it's being quite useful on the logging/debugging side.

[EugenMayer]

I need to review this when I am back at home, generally speaking, it will be merged for sure

[EugenMayer]

Thank you for the patch, looks good. For the next time, please do not combine refactoring with an actual feature ( forkexec -> fork_exec ..threadexec ) since this makes things a lot more complicated. Refactoring must be done in a very sensible time slot - i did not block it this time since i think its ok for now, but lets not do this again.

Thank you for this great contribution!

[tiagopog]

You're right, my bad. Anyway, thanks for warning. Cheers!