[UPDATE] enhancements

[UPDATE] enhancements
Ensure that generated classes (structs, services, enumerations) are
named uniquely by updating WsdlToPhpModel::getPackagedName() method
using WsdlToPhpModel::uniqueName()
Clean WsdlToPhpStructAttributeValue::getCleanName() call in
WsdltophpStruct::getClassBody()
Remove useless comments and add test case