samples: sockets: dumb_http_server: Disable TIME_WAIT delay
samples: sockets: dumb_http_server: Disable TIME_WAIT delay

This is required to test the server with ab (ApacheBench), which
itself is an important integration test for the IP stack.

Fixes: #7377

Signed-off-by: Paul Sokolovsky <35cb557f011771c94f127d6fef99f804b62203f5@linaro.org>

mbolivar/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,kraj/zephyr,zephyriot/zephyr,mbolivar/zephyr,zephyriot/zephyr,Vudentz/zephyr,finikorg/zephyr,punitvara/zephyr,explora26/zephyr,kraj/zephyr,punitvara/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,nashif/zephyr,mbolivar/zephyr,kraj/zephyr,mbolivar/zephyr,zephyriot/zephyr,ldts/zephyr,explora26/zephyr,ldts/zephyr,punitvara/zephyr,zephyriot/zephyr,finikorg/zephyr,galak/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,ldts/zephyr,galak/zephyr,finikorg/zephyr,ldts/zephyr,Vudentz/zephyr,GiulianoFranchetto/zephyr,finikorg/zephyr,GiulianoFranchetto/zephyr,zephyrproject-rtos/zephyr,punitvara/zephyr,finikorg/zephyr,Vudentz/zephyr,galak/zephyr,explora26/zephyr,ldts/zephyr,zephyriot/zephyr,mbolivar/zephyr,kraj/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,nashif/zephyr,nashif/zephyr,galak/zephyr,explora26/zephyr,nashif/zephyr