Supply from filesystem infinispan configuration

Supply from filesystem infinispan configuration

- In order to speed up the prototyping time, allow to supply an
infinispan configuration from the filesystem along the one embedded in
the clustering.services-implementation. This can be specified by
supplying the property org.infinispan.config.file
- Align to 5.3 the XSD used in the infinispan config file, seems there
are different defaults between 5.1 XSD and 5.3

Change-Id: Ied87ecc56725b89b5c85ff21ae185f5d68988ab1
Signed-off-by: Giovanni Meo <gmeo@cisco.com>