High: SAPDatabase: Add support for Oracle 12c

To work with Oracle 12c the agent needs an option
to pass the new Database Username to the resource.

Example configuration:

primitive oracle-database SAPDatabase \

params \
    SID=HAO \
    DBTYPE=ORA \
    DBOUSER=oracle \
    STRICT_MONITORING=1 \
op monitor interval=120 timeout=60