Fix timeout on ajax_verify_external_connection

[madmax3365]

Related to #244. We can use these methods to check connections, it gives us a 4x performance boost.

[jeffpaul]

@dkotter does your work touch this area of the code? If not, then I'm inclined to see if we can resolve the build error and look to land this alongside the performance improvements you've opened for v1.5.0.

[dkotter]

@jeffpaul Nope, the performance changes I've been working on have only touched how we get internal connections, not external.

[jeffpaul]

@madmax3365 it looks like the build failed on these changes, mind giving those a review to try and ensure this build passes?

[madmax3365]

@jeffpaul It seems that problem is in Travis. We have another pull request #262 that failed due to the same reason
No output has been received in the last 10m0s, this potentially indicates a stalled build or something wrong with the build itself.
I think you had some problems with Travis back then, so to avoid unnecessarily commits you can rerun the build.

[jeffpaul]

@adamsilverstein @dkotter if either of you have time to review this that would be great, thanks!

[helen]

At first glance this makes a lot of sense to me - I'd like to group this together with #45 and #368 (not dependent on #368) so we can also use this to display a more granular status check for a given connection. Moving to 1.6.

[dinhtungdu]

Tested with 100 CPT and this PR handle it very well while couldn't do the same with the current develop branch. Great work! Here are just some suggestions to make the codebase more maintainable.

[madmax3365]

@dinhtungdu Applied code changes as you suggested.

[dinhtungdu]

@madmax3365 Thanks! I added some comments on your updates :)