log: add debugging logs

log: add debugging logs

	commit 72b8e3b37c109aebeab15e9692fc9e98131eabd6
	Author: Dipen Somani <dipen.somani@samsung.com>
		Debug logs added to identify the failure cause of wl_display_connect()

	commit 83cf12e7ca426c69571d952716625707009d2ac6
	Author: Bhavi Dhingra <b.dhingra@samsung.com>
		Adding debug information about pending requests from client, before it is aborted, if sendmsg() fails due to EAGAIN error

	commit 4f1f607365c017c864aef54713dbd11a02d514e1
	Author: Dipen Somani <dipen.somani@samsung.com>
		wayland-server: Added debug logs for client disconnection

	commit 2ee9534c137a0d3a7b5f81422eedd0f2ccded5c7
	Author: Dipen Somani <dipen.somani@samsung.com>
		Wayland-server: Added warning logs if application binds with a lower version of the interface than that of the event.

	commit f6c29ea10a9f09be82c195608d485287bb12006b
	Author: ritesh.u <ritesh.u@samsung.com>
		wayland-server: Error log for client disconnection on hangup/error flag set

Change-Id: Ie255b6637226c5e3ad3593d22aa9ec4905fb947f