INT-2996 Fix Class and Package Cycles

INT-2996 Fix Package Cycle

Move interface ...store.MetadataStore to ...store.metadata.

INT-2996 Fix Class Tangle

TcpConnectionEvent incorrectly referenced the
concrete TcpConnectionSupport instead of TcpConnection.
Merge pull request #788 from garyrussell/INT-2996

* garyrussell-INT-2996:
  INT-2996 Fix Class and Package Cycles