[JDV][DOCS] Update documentation wrt new JDV 6.4 / JDG 7.1.1 integration

https://doc-stage.usersys.redhat.com/documentation/en-us/red_hat_jboss_data_virtualization/6.4/html-single/red_hat_jboss_data_virtualization_for_openshift/#using_jboss_datagrid_for_openshift_with_jdv_for_openshift

needs to be rewritten, as the resource adapter configuration has changed for JDG 6.4 / JDG 7.1.1

1. POJOs are now not used, instead protobuf file can be used directly in VDB, or defined by a virtual table in DDL

2. The following RA properties were removed or not used now:

CacheTypeMap
ProtobufDefinitionFile
MessageDescriptor
Module
MessageMarshallers
AdminUserName
AdminPassword
AuthUserName
AuthPassword
AuthApplicationRealm
AuthServerName
AuthSASLMechanism
AdminUserName
AdminPassword

The following are now used still / instead:

RemoteServerList
UserName
Password
AuthenticationRealm
AuthenticationServerName
SaslMechanism

3. Some of the things are now configured in VDB directly (like the name of the cache)

see https://teiid.gitbooks.io/documents/reference/Infinispan_Translator.html

Some of the things are probably documented in the JDV 6.4 documentation, we should link to it where appropriate.