ubcli: support multitenancy migrations
Support multitenancy migrations by:
- run DDL stage under DB owner user, skip data, regular scripts and update model versions
- run tenant data stage under MT (regular) user, in a loop
Introduced new command "migrateTenants" Command "migrate" support new options: "-noscripts", "noversions"
Table "ub_migration" now has "multitenancy" mixin enabled:
- *DDL scripts always executed only DB owner and saved with mi_tenantID=0
- all other scripts executed normally, in a loop for every tenant and saved with mi_tenantID=