Upgrade Datanode servers to v5.2

In a HA environment, RabbitMQ and MySQL may be together on a Datanode server.

Abiquo will upgrade to new versions of RabbitMQ and MySQL that require a manual upgrade path of dependencies.

These steps are for a server that contains RabbitMQ AND MySQL

Shut down the Galera cluster. See Stop and start HA configuration.

Remove the Erlang and Galera packages.

yum remove erlang* galera
yum clean all && yum makecache

Install new RabbitMQ and MariaDB server
```
yum install rabbitmq-server MariaDB-server
```
Before you confirm, check that the packages will be installed from the abiquo-base repository
1. rabbitmq-server: 3.8.2.1
2. MariaDB-server: 10.4.10.1
Upgrade Abiquo to 5.2.x
```
yum update
```
Before you confirm, check the following packages will be installed from the abiquo-base repository:
1. jdk: 11.0.6u10
2. redis: 5.0.7.1

Enable the new services

systemctl enable mariadb
systemctl enable rabbitmq-server

Edit the MySQL configuration to use the new version of Galera.
The configuration file can be found at
```
/etc/my.cnf.d/galera.cnf
```
Change the wsrep_provider line to use the new version of Galera (in the galera-4 folder)
```
wsrep_provider=/usr/lib64/galera-4/libgalera_smm.so
```
Start Galera, which will also start MySQL.
Check the Galera state data.
```
cat /var/lib/mysql/grastate.dat
```
Find the server which is safe to bootstrap
```
safte_to_bootstrap: 1
```
Start Galera
```
galera_new_cluster
```
On the other servers in the cluster, start MariaDB
```
systemctl start mariadb
```
For more details see Stop and start HA configuration
Start RabbitMQ on all datanode servers
```
systemctl start rabbitmq-server
```
Upgrade MySQL on all datanode servers
```
mysql_upgrade
```
The mysql_upgrade step may detect errors that trigger messages such as the following:
kinton_accounting.ACCOUNT_PERIOD_USAGE_VW Error : Column count of mysql.proc is wrong. Expected 21, found 20. Created with MariaDB 100129, now running 100410. Please use mysql_upgrade to fix this error
These messages are expected and this same mysql_upgrade process will automatically fix these errors in its next stages.
Check that the mysql_upgrade process completes correctly.
Check that your hostname is in your DNS or in your /etc/hosts file
Upgrade the Abiquo API databases. This script is available on the API Server.
```
abiquo-db [-h DB hostname] [-P DB port] [-u user] [-p password] update
```
If the liquibase update fails with a message similar to the following:
Liquibase update Failed: Validation Failed:
1 change sets check sum
src/X.X.X-XX/kinton-X.X.X.xml::ABICLOUDPREMIUM-XXXX-XxxxxxxxXXxXxxxxxxXxxxxx::XXXXXXXXX is now: 7:ee2fa6e058ec76c7abf801567898917d
For more information, use the --logLevel flag
Do the following steps
1. Clear the database checksums
  abiquo-db clearCheckSums
2. Retry the above abiquo-db update command.