Removed deprecated run_tests.sh
Removed deprecated run_tests.sh

run_tests.sh was deprecated half a year ago. not it's a safe time
to remove it from the source tree.

Change-Id: I284ea8b0e956f5b6e5f97f85facf69b8cfbd6442

chenyujie/hybrid-murano,sajuptpm/murano,olivierlemasle/murano,NeCTAR-RC/murano,openstack/murano,chenyujie/hybrid-murano,telefonicaid/murano,DavidPurcell/murano_temp,satish-avninetworks/murano,satish-avninetworks/murano,satish-avninetworks/murano,DavidPurcell/murano_temp,DavidPurcell/murano_temp,openstack/murano,olivierlemasle/murano,NeCTAR-RC/murano,olivierlemasle/murano,telefonicaid/murano,satish-avninetworks/murano,DavidPurcell/murano_temp,olivierlemasle/murano,NeCTAR-RC/murano,sajuptpm/murano,NeCTAR-RC/murano