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

so if 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://...
Merge branch 'master' of git://github.com/geotools/geotools