TAB-4720: fix invalid Management Agent unregistration from the TSA agent when the 1st created cache manager gets shut down

git-svn-id: http://svn.terracotta.org/svn/ehcache@9092 b9324663-ca0f-0410-8574-be9b3887307d
EHC-1079 Merge from trunk: c9063,9063,9088

git-svn-id: http://svn.terracotta.org/svn/ehcache@9093 b9324663-ca0f-0410-8574-be9b3887307d
EHC-1079 Narrowed lock held scope

git-svn-id: http://svn.terracotta.org/svn/ehcache@9094 b9324663-ca0f-0410-8574-be9b3887307d
EHC-1079 Merged c9094 from trunk

git-svn-id: http://svn.terracotta.org/svn/ehcache@9095 b9324663-ca0f-0410-8574-be9b3887307d
EHC-1079 Merged c9094 from trunk

git-svn-id: http://svn.terracotta.org/svn/ehcache@9096 b9324663-ca0f-0410-8574-be9b3887307d
EHC-1079 Merged c9094 from trunk

git-svn-id: http://svn.terracotta.org/svn/ehcache@9097 b9324663-ca0f-0410-8574-be9b3887307d