TAB-4997 : expose clientUUID via the EhCacheMBean, to allow the TSA to retrieve the agentId of an L1

git-svn-id: http://svn.terracotta.org/svn/ehcache@9245 b9324663-ca0f-0410-8574-be9b3887307d
TAB-4997 : merge from 2.9.x

git-svn-id: http://svn.terracotta.org/svn/ehcache@9246 b9324663-ca0f-0410-8574-be9b3887307d
TAB-4997 : merge from 2.9.x

git-svn-id: http://svn.terracotta.org/svn/ehcache@9247 b9324663-ca0f-0410-8574-be9b3887307d
Delete ehcache-2.9.0 tag to retag.

git-svn-id: http://svn.terracotta.org/svn/ehcache@9248 b9324663-ca0f-0410-8574-be9b3887307d
Tag ehcache-2.9.0 from 4.2.0-rc branch

git-svn-id: http://svn.terracotta.org/svn/ehcache@9249 b9324663-ca0f-0410-8574-be9b3887307d