Support connection timeout with ability to pause the timer for credentials

[sbadugu]

From @sanjay-saxena on January 21, 2015 19:20

If a login dialog is being shown to the user, then the timer should pause while the dialog is up. Once the user provides the credentials and dismisses the dialog, the timer should resume.

Copied from original issue: kaazing/netx.http#24

[sbadugu]

From @sanjay-saxena on January 21, 2015 19:29

HttpURLConnection supports setAllowUserInteraction(boolean). However, it is not clear if this will work for Application * authentication schemes that are handled outside the purview of the system java.net.Authenticator.