* Improve and link Network Proxy docs
It is possible for proxy issues to cause "unable to open shell", so
detail there.
Having the "how-to" in the debug page makes more sense than on the
porting page, so move it.
Fixed a few formatting issues at the same time.
* Edits
* typo
* Add command_timeout timer that defines the amount
of time to wait for a command or RPC call before
timing out.
* Remove connect_retries and connect_interval configuration
varaible and replace it with connect_retry_timeout to control
the timeout value of connection to local scoket.
* Make required changes to netowrk action plugins and relevant
network files in module_utils.
* Required documentation changes.
