samples: net: dns_resolver: Add config options for tests
samples: net: dns_resolver: Add config options for tests

Make sure that we compile sanity checked application with
more config options in order to catch compile issues faster.
In this case DHCPv4 + debugging options are enabled for
sanity checker.

Signed-off-by: Jukka Rissanen <f9f077d1da4c7aa947f9864fa5a28c3588f6a45d@linux.intel.com>

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