Remove references to 5.5

The major version is EOL

Change-Id: I98afec078f0610eace7b9e832b3326ee70ab7f19

Author: ltangvald

README.md

@@ -16,8 +16,6 @@ Supported Tags and Respective Dockerfile Links
 
 These are tags for some of the optimized MySQL Server Docker images, created and maintained by the MySQL team at Oracle (for a full list, see [the Tags tab of this page](https://hub.docker.com/r/mysql/mysql-server/tags/)). [DS] The tags are updated directly on the posted Markdown versions by RE after eahc release, so it might remain outdated in this DocBook source file.
 
--   MySQL Server 5.5 (tag: [`5.5`, `5.5.62`, `5.5.62-1.1.8`](https://github.com/mysql/mysql-docker/blob/mysql-server/5.5/Dockerfile)) ([mysql-server/5.5/Dockerfile](https://github.com/mysql/mysql-docker/blob/mysql-server/5.5/Dockerfile))
-
 -   MySQL Server 5.6 (tag: [`5.6`, `5.6.42`, `5.6.42-1.1.8`](https://github.com/mysql/mysql-docker/blob/mysql-server/5.6/Dockerfile)) ([mysql-server/5.6/Dockerfile](https://github.com/mysql/mysql-docker/blob/mysql-server/5.6/Dockerfile))
 
 -   MySQL Server 5.7 (tag: [`5.7`, `5.7.24`, `5.7.24-1.1.8`](https://github.com/mysql/mysql-docker/blob/mysql-server/5.7/Dockerfile)) ([mysql-server/5.7/Dockerfile](https://github.com/mysql/mysql-docker/blob/mysql-server/5.7/Dockerfile))

gen_dockerfiles.sh

@@ -25,27 +25,23 @@ REPO=https://repo.mysql.com; [ -n "$1" ] && REPO=$1
 
 # 33060 is the default port for the mysqlx plugin, new to 5.7
 declare -A PORTS
-PORTS["5.5"]="3306"
 PORTS["5.6"]="3306"
 PORTS["5.7"]="3306 33060"
 PORTS["8.0"]="3306 33060 33061"
 
 declare -A PASSWORDSET
-PASSWORDSET["5.5"]="SET PASSWORD FOR 'root'@'localhost'=PASSWORD('\${MYSQL_ROOT_PASSWORD}');"
-PASSWORDSET["5.6"]=${PASSWORDSET["5.5"]}
+PASSWORDSET["5.6"]="SET PASSWORD FOR 'root'@'localhost'=PASSWORD('\${MYSQL_ROOT_PASSWORD}');"
 PASSWORDSET["5.7"]="ALTER USER 'root'@'localhost' IDENTIFIED BY '\${MYSQL_ROOT_PASSWORD}';"
 PASSWORDSET["8.0"]=${PASSWORDSET["5.7"]}
 
 declare -A DATABASE_INIT
-DATABASE_INIT["5.5"]="mysql_install_db --user=mysql --datadir=\"\$DATADIR\" --rpm"
 DATABASE_INIT["5.6"]="mysql_install_db --user=mysql --datadir=\"\$DATADIR\" --rpm --keep-my-cnf"
 DATABASE_INIT["5.7"]="\"\$@\" --initialize-insecure"
 DATABASE_INIT["8.0"]="\"\$@\" --initialize-insecure"
 
 # 5.7+ has the --daemonize flag, which makes the process fork and then exit when
 # the server is ready, removing the need for a fragile wait loop
 declare -A INIT_STARTUP
-INIT_STARTUP["5.5"]="\"\$@\" --skip-networking --socket=\"\$SOCKET\" \&"
 INIT_STARTUP["5.6"]="\"\$@\" --skip-networking --socket=\"\$SOCKET\" \&"
 INIT_STARTUP["5.7"]="\"\$@\" --daemonize --skip-networking --socket=\"\$SOCKET\""
 INIT_STARTUP["8.0"]="\"\$@\" --daemonize --skip-networking --socket=\"\$SOCKET\""
@@ -57,29 +53,25 @@ STARTUP["5.7"]="exec \"\$@\""
 STARTUP["8.0"]="env MYSQLD_PARENT_PID=\$\$ \"\$@\""
 
 declare -A STARTUP_WAIT
-STARTUP_WAIT["5.5"]="\"yes\""
 STARTUP_WAIT["5.6"]="\"yes\""
 STARTUP_WAIT["5.7"]="\"\""
 STARTUP_WAIT["8.0"]="\"\""
 
 # The option to set a user as expired, (forcing a password change before
 # any other action can be taken) was added in 5.6
 declare -A EXPIRE_SUPPORT
-EXPIRE_SUPPORT["5.5"]="\"\""
 EXPIRE_SUPPORT["5.6"]="\"yes\""
 EXPIRE_SUPPORT["5.7"]="\"yes\""
 EXPIRE_SUPPORT["8.0"]="\"yes\""
 
 # sed is for https://bugs.mysql.com/bug.php?id=20545
 declare -A TZINFO_WORKAROUND
-TZINFO_WORKAROUND["5.5"]="sed 's/Local time zone must be set--see zic manual page/FCTY/' | "
 TZINFO_WORKAROUND["5.6"]="sed 's/Local time zone must be set--see zic manual page/FCTY/' | "
 TZINFO_WORKAROUND["5.7"]=""
 TZINFO_WORKAROUND["8.0"]=""
 
 # Logging to console (stderr) makes server log available with the «docker logs command»
 declare -A DEFAULT_LOG
-DEFAULT_LOG["5.5"]=""
 DEFAULT_LOG["5.6"]=""
 DEFAULT_LOG["5.7"]=""
 DEFAULT_LOG["8.0"]="console"