tarantool / tarantool / 12324

push

travis-ci

session: introduce session vtab and meta

box.session.push implementation depends on session type -
console session must send YAML tagged text, binary session must
send MessagePack via another thread, other sessions must return
error.

Add virtual table to a session with 'push', 'fd' and 'sync'
functions.

The same virtual table together with struct session meta can be
used to use memory of struct session more effectively. Before the
patch session stored sync and fd as attributes, but:
* fd was duplicated for iproto, which already has fd in
  connection;
* sync is used only by iproto, and just occupies 8 byte in other
  sessions;
* after the #2677 session additionaly must be able to store
  iproto connection pointer.

Struct session meta uses C union to store either iproto, or
console, or another meta, but not all of them together.

Part of #2677

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