after review fix: remove group name param in config.

gh-918 tarantoolctl group support implemented with default user group

This test was disabled by me during 1.6 async-master-master development.
Since Tarantool doesn't use proc_title for replication status anymore,
I added a new test that check box.info.replication.

Prepare for multi-master.

Linux-specific option obsolete since kernel 2.2

Wait() no longer called hence waiters not initialized. Does it make
sence to have a test for :waiters (undocumented internals)?

- Waiting on a brand new socket (neither listen nor connect called)
  completes immediately with HUP status on Linux. However on FreeBSD/osx
  it never completes.

- Attempting to connect to a port bound on a loopback interface which is
  not yet listening yield ECONNREFUSED in blocking mode on Linux. On
  FreeBSD/osx blocking connect never completes ("never" means it doesn't
  complete in a reasonable time).

- Calling shutdown() on a listening socket works in Linux but in
  FreeBSD/osx it doesn't.

Note: it was incomplete, made thing unnecessary complex and it did not
align with the CMake way (c) for crosscompilation.

Pass sysroot on OSX.
Make the code in luajit.cmake a bit more sane and straightforward.

Note: v1 of this patch was reverted due to performance regression.

* log messages correctly in case of SocketError
* a step towards making replica_connect() reusable
  from the outside.

Update reference to the pure php client

This reverts commit 615f0985.

This reverts commit 3010b98b.

Document UPSERT in the protocol spec.

* allocate struct replica on heap
* identify the master in join request
  by sending back its server id

Build system fixes on osx, +misc.

Pass sysroot.
Abort build if preprocessing fails (a stage in tarantool.h generation).

Note: it was incomplete, made thing unnecessary complex and it did not
align with the CMake way (c) for crosscompilation.

Pass sysroot on OSX.
Make the code in luajit.cmake a bit more sane and straightforward.

We were passing -g flag twice, just uncool.

gh-1017 double-run bug fixed, and fixed same bug in stat_net. But bug with probability doesn't repeated

gh-1017 double-run bug fixed, and fixed same bug in stat_net. But bug with probability doesn't repeated