split datasources between xpanse and activiti

[swaroopar]

Currently we use the same datasource between xpanse and activiti. This must be changed.

• Add new properties that defines datasource URL, username and password for activiti.
• For dev, use the same H2 database but with different schema name.
• In mysql.properties as well, provide the same URL but with different schema name.
• Test workflow

Note - if necessary the xpanse users can use a completely different database for activiti and xpanse. So we must provide completely different datasource config.

[WangLiNaruto]

let me do it