Minor formatting in rlm_couchbase
Rename mod_socket_create/delete to mod_conn_create/delete
Pass a threadsafe ctx into fr_connection_pool create callback

Create callbacks should allocate any connection specific data in this specially created thread safe ctx.

For freeing connection specific data, a talloc destructor should be used. The delete callback will be
removed shortly.
Remove fr_connection_delete
Other obviously bad, allocations