Ondemand preserving database user config

[svaroqui]

• We generate the config per server in datadir if not exists : today it is only on API call to download config
• Add a dummy.cnf config file that will indicate the datadir of config for this server

cat $MARIADB_HOME/dummy.cnf
[mysqld]
!includedir /Users/apple/go/src/github.com/signal18/replication-manager/data/bench/db1.bench.svc.cloud18_3306/init/etc/mysql/conf.d

• we locally execute a dummy mariadbd start

MARIADB_HOME=/Users/apple/go/src/github.com/signal18/replication-manager/data/bench/db1.bench.svc.cloud18_3306/init/etc/mysql;  echo '[mysqld]\n!includedir '$MARIADB_HOME'/conf.d' > $MARIADB_HOME/dummy.cnf ;  mariadbd --defaults-file=$MARIADB_HOME/dummy.cnf --print-defaults  | sed -e "s/--loose_/\n/g" | sed -e "s/--/\n/g" | grep  '=' | sed "s/=/\" : \"/"  | sed -e "s/^/\"/" | sed -e "s/ $/\",/" | awk '{print toupper($0)}' |sed '$ s/.$/\n}/' | sed -e "1s/^/{\n/" | jq`

• We then output this result in configurator_variables.json
• We the compare this result with what we get from the monitoring
• Add API Call to list the variables diff , servers//config/actions/preserved/<variable_name>
• We populate preserved_variables.json form API call
• On config we then used the preserved_variables.json variables instead of the saved ones