Ensure client run during container init uses localhost interface

The MYSQL_HOST environment variable overrides the host setting
for the client if it's set, which can cause init failure, so
we override it to -hlocalhost to prevent this.

Author: ltangvald

5.5/docker-entrypoint.sh

@@ -40,7 +40,7 @@ if [ "$1" = 'mysqld' ]; then
 		"$@" --skip-networking --socket=/var/run/mysqld/mysqld.sock &
 		pid="$!"
 
-		mysql=( mysql --protocol=socket -uroot --socket=/var/run/mysqld/mysqld.sock)
+		mysql=( mysql --protocol=socket -uroot -hlocalhost --socket=/var/run/mysqld/mysqld.sock)
 
 		for i in {30..0}; do
 			if echo 'SELECT 1' | "${mysql[@]}" &> /dev/null; then

5.6/docker-entrypoint.sh

@@ -40,7 +40,7 @@ if [ "$1" = 'mysqld' ]; then
 		"$@" --skip-networking --socket=/var/run/mysqld/mysqld.sock &
 		pid="$!"
 
-		mysql=( mysql --protocol=socket -uroot --socket=/var/run/mysqld/mysqld.sock)
+		mysql=( mysql --protocol=socket -uroot -hlocalhost --socket=/var/run/mysqld/mysqld.sock)
 
 		for i in {30..0}; do
 			if echo 'SELECT 1' | "${mysql[@]}" &> /dev/null; then

5.7/docker-entrypoint.sh

@@ -40,7 +40,7 @@ if [ "$1" = 'mysqld' ]; then
 		"$@" --skip-networking --socket=/var/run/mysqld/mysqld.sock &
 		pid="$!"
 
-		mysql=( mysql --protocol=socket -uroot --socket=/var/run/mysqld/mysqld.sock)
+		mysql=( mysql --protocol=socket -uroot -hlocalhost --socket=/var/run/mysqld/mysqld.sock)
 
 		for i in {30..0}; do
 			if echo 'SELECT 1' | "${mysql[@]}" &> /dev/null; then

8.0/docker-entrypoint.sh

@@ -40,7 +40,7 @@ if [ "$1" = 'mysqld' ]; then
 		"$@" --skip-networking --socket=/var/run/mysqld/mysqld.sock &
 		pid="$!"
 
-		mysql=( mysql --protocol=socket -uroot --socket=/var/run/mysqld/mysqld.sock)
+		mysql=( mysql --protocol=socket -uroot -hlocalhost --socket=/var/run/mysqld/mysqld.sock)
 
 		for i in {30..0}; do
 			if echo 'SELECT 1' | "${mysql[@]}" &> /dev/null; then