session2: be consistent with asserts

darcs-hash:20090423090537-b2873-8311666f6c6b96afb56e4b35db2879fd93342afc
session2: update 'streams' attribute in connect()

darcs-hash:20090423091345-b2873-f7d07ef6347147f62490b1d29d7f665d54188280