Update travis.sh, ASAN using devtoolset-7

ci/travis.sh

@@ -37,6 +37,10 @@ if [ -n "${INSTALL_DEPENDENCY_LIBRARY}" ]; then
       yum install -y $INSTALL_DEPENDENCY_LIBRARY
 fi
 
+if [ $ASAN_OPTION ];then
+	source /opt/rh/devtoolset-7/enable
+fi
+
 mkdir build || true
 cd build