apps/examples/webserver_test: Fix webserver_test keep-alive test scenario.
apps/examples/webserver_test: Fix webserver_test keep-alive test scenario.

Problem : In webserver_test, the variable read_finish becomes True to signify parsing has finished.
But when using webserver_test with keep-alive it becomes a problem as it does not parse the subsequent responses after the first keep-alive response since read_finish is already True.

How to reproduce : webserver_test 1 GET http://127.0.0.1/ keep-alive=5
This command will send 5 GET requests in one keep-alive session but will parse only the first response and skip remaining 4 responses.

Fix : Inside the keep-alive for loop read_finish variable is reset to False for every iteration.

junmin-kim/TizenRT,sunghan-chang/TizenRT,pillip8282/TizenRT,pillip8282/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,sunghan-chang/TizenRT,jeongchanKim/TizenRT,jeongchanKim/TizenRT,junmin-kim/TizenRT,jeongarmy/TizenRT,an4967/TizenRT,jeongarmy/TizenRT,pillip8282/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,junmin-kim/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,pillip8282/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,pillip8282/TizenRT,jeongarmy/TizenRT,jeongarmy/TizenRT,an4967/TizenRT,pillip8282/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,Samsung/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT,Samsung/TizenRT,junmin-kim/TizenRT,an4967/TizenRT,Samsung/TizenRT,junmin-kim/TizenRT,pillip8282/TizenRT,junmin-kim/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,Samsung/TizenRT,junmin-kim/TizenRT,jeongchanKim/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT