dspace-services: Disable update check in ehcache

Some DSpace components rely on an upstream project called Ehcache
which has the unfortunate policy of calling home to check if there
are any updates every time it is invoked. The update call includes
lots of information about the server environment, including the OS
and Java versions, and of course the IP address of the server.

In addition to this being a jarring leak of privacy, it is also not
very effective, as the DSpace user is not in control of the version
of Ehcache being used! Furthermore, some parts of the DSpace code
will invoke this code hundreds of times, for example in AIP ingest,
and it's mind boggling that there should be a call to what amounts
to be a random server on the Internet (as far as the DSpace site's
owner is concerned).

There is an issue on the upstream project's bug tracker where they
have said they will not fix it, so we will just disable it locally.

See: https://jira.terracotta.org/jira/browse/EHC-461

dspace-services/src/main/resources/caching/ehcache-config.xml

@@ -8,7 +8,7 @@
     http://www.dspace.org/license/
 
 -->
-<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd">
+<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="ehcache.xsd" updateCheck="false">
 
     <!-- Sets the path to the directory where cache .data files are created.