build.sh fails if the user does not have CREATE DATABASE permissions.

`CreateUserDatabase `fails with permission error:

```
Vuser 1:RUNNING
Vuser 1:Monitor Thread
Vuser 1:CREATING CLOUDSA SCHEMA
Vuser 1:CREATING DATABASE postgres under OWNER cloudsa
Vuser 1:Using existing User cloudsa for Schema build
Vuser 1:Using existing empty Database postgres for Schema build
Error in Virtual User 1: ERROR: permission denied to change owner of database
```

is the PGUSER does not have CREATE DATABASE permissions.

It should be possible to skip ALTER DATABASE commands when they are not necessary to avoid permission errors. In this case
CreateUserDatabase function could check if the PGUSER is the owner of the database and skip the ALTER commands, this permission error can be avoided.

Quick and dirty workaround is to remove
`set sql($stmnt_count) "ALTER DATABASE $db OWNER TO $user"`

in CreateUserDatabase.