GEOT-4361: also support connection to Oracle LDAP additional to Oracle RAC

so if option db starts with "ldap://", i.e. ldap://[host]/[db],cn=OracleContext,dc=[oracle_ldap_context]
this will result in a connection string
jdbc:oracle:thin:@ldap://...

similar to Oracle RAC: if option db starts with "(" this will result in a connection string
jdbc:oracle:thin:@(...
e.g.: jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=[host])(PORT=[port, often 1521]))(LOAD_BALANCE=YES)(CONNECT_DATA=(SERVICE_NAME=[oracle_service_name])))