[Zend\Soap\Server][NEW] add a getSoap method, return the internal SoapServer instance
[FIX] remove the root namespace in front of SoapServer
Merge pull request #5811 from lilobase/SoapServerGetSoapServerInstance

[Zend\Soap\Server][NEW] add a getSoap method, return the internal instance

Conflicts:
	tests/ZendTest/Soap/ServerTest.php

Changes name of `_getSoap()` to `getSoap()`, and gives it public visibility.
Merge branch 'feature/5811' into develop

Close #5811