Use UniqueIdentifierGenerator::getIdentifier to generate unique names for helper methods

[shochdoerfer]

To avoid naming collisions make use of UniqueIdentifierGenerator::getIdentifier to generate unique method names for the following methods:

• getParameter()
• wrapBeanAsLazy()

Since these helper methods are accessible from the outside or "magic" methods needed by PHP we cannot generate unique methods names:

• __construct()
• getAlias()
• hasAlias()
• __sleep()
  Ideally the ConfigurationGenerator should be extended to check for naming collisions and report errors upfront.