Allow customizing Tenants DB JDBC uid/pwd/driver (FINERACT-806) (#713)

* Allow customizing Tenants DB JDBC uid/pwd/driver (FINERACT-806)

Added Java system properties for username and password to docker-compose

Modified sever.xml to get username and password

* Fixes for customizing Tenants DB JDBC uid/pwd/driver (FINERACT-806)

* Use random MYSQL_ROOT_PASSWORD in docker-compose.yml (FINERACT-806)

This provides future non-regression testing that the the customized
MySQL password is actually really used, and it doesn't just work because
"mysql" is still hard-coded anywhere.

Co-authored-by: Yemdjih Kaze Nasser <kaze.nasser@outlook.com>

docker/server.xml

@@ -41,10 +41,10 @@
      <Resource type="javax.sql.DataSource"
         name="jdbc/mifosplatform-tenants"
         factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
-        driverClassName="org.drizzle.jdbc.DrizzleDriver"
+        driverClassName="${fineract_tenants_driver}"
         url="${fineract_tenants_url}"
-        username="root"
-        password="mysql"
+        username="${fineract_tenants_uid}"
+        password="${fineract_tenants_pwd}"
         initialSize="3"
         maxActive="10"
         maxIdle="6"