Connection Idle timeout feature for TCP Adaptor

[kgiusti]

Proposal: Add the ability to detect and close idle TCP connections.

Add a new configuration attribute to the tcpConnector and tcpListener records - idleTimeoutSecs. This value sets a limit to the time a TCP connection can remain idle - i.e. passing no data - before the router will proactively close the connection. The value is expressed in seconds. A value of zero disables the idle timeout (the connection will not be closed).

If configured on both ends of the connection (both the tcpConnector and the tcpConnection) the lowest value takes precedence.

[kgiusti]

I'm thinking that we probably only need to add this to the tcpListener since it doesn't matter which side of the connection is closed.

[kgiusti]

Leaving as draft for the moment. As written it will require a fix to #1155 since this patch requires a large number of simultaneously active timers.

[ganeshmurthy]

Closing this since the associated PR is closed. Reopen if necessary