Use socket connexion since it's the default

scripts/deb-install.sh

@@ -99,17 +99,8 @@ if [[ -n $spider_package_list ]]; then
   sudo sh -c "DEBIAN_FRONTEND=noninteractive MYSQLD_STARTUP_TIMEOUT=180 apt-get install -y $spider_package_list"
 fi
 
-# Unix socket (after 10.3)
-if [ "${master_branch}" != 10.3 ]; then
-  sudo mysql -e "set password=password('rootpass')"
-else
-  # Even without unix_socket, on some of VMs the password might be not
-  # pre-created as expected. This command should normally fail.
-  sudo mysql -uroot -e "set password = password('rootpass')" >/dev/null 2>&1
-fi
-
-mysql --verbose -uroot -prootpass -e "create database test; use test; create table t(a int primary key) engine=innodb; insert into t values (1); select * from t; drop table t; drop database test; create user galera identified by 'gal3ra123'; grant all on *.* to galera;"
-mysql -uroot -prootpass -e "select @@version"
+sudo mysql --verbose -e "create database test; use test; create table t(a int primary key) engine=innodb; insert into t values (1); select * from t; drop table t; drop database test; create user galera identified by 'gal3ra123'; grant all on *.* to galera;"
+sudo mysql -e "select @@version"
 bb_log_info "test for MDEV-18563, MDEV-18526"
 set +e
 

scripts/deb-upgrade.sh

@@ -226,11 +226,11 @@ wait_for_mariadb_upgrade
 
 # run mysql_upgrade for non GA branches
 if [[ $major_version == "$development_branch" ]]; then
-  sudo -u mysql mysql_upgrade -uroot -prootpass
+  sudo mysql_upgrade
 fi
 
 # Make sure that the new server is running
-if mysql -uroot -prootpass -e "select @@version" | grep "$(cat /tmp/version.old)"; then
+if sudo mysql -e "select @@version" | grep "$(cat /tmp/version.old)"; then
   bb_log_err "the server was not upgraded or was not restarted after upgrade"
   exit 1
 fi

scripts/rpm-upgrade.sh

@@ -258,14 +258,14 @@ if [[ $test_type == "major" ]]; then
 fi
 
 # Make sure that the new server is running
-if mysql -uroot -prootpass -e "select @@version" | grep "$old_version"; then
+if sudo mysql -e "select @@version" | grep "$old_version"; then
   bb_log_err "the server was not upgraded or was not restarted after upgrade"
   exit 1
 fi
 
 # Run mysql_upgrade for non-GA branches (minor upgrades in GA branches shouldn't need it)
 if [[ $major_version == "$development_branch" ]] || [[ $test_type == "major" ]]; then
-  sudo -u mysql mysql_upgrade -uroot -prootpass
+  sudo mysql_upgrade
 fi
 set +e