So that we can access next_run_id and next_range_id directly.
In order not to introduce dependency on latch.h, allocate a latch
from heap and use forward declaration.

Currently, vy_recovery_load_index() only calls the callback for
VY_LOG_INSERT_RANGE and VY_LOG_INSERT_RUN types of records, but not
for VY_LOG_NEW_INDEX, because the latter is not needed during index
recovery. However, we will need this event for vinyl metadata log
rotation, so let's make vy_recovery_load_index() call the callback
for this type of record too.

Not necessary as log records are checksummed.

net.box: set default timeout to 10s
tarantoolctl: set console connection timeout to inifinity

Closes #2054

closes gh-1925

* Don't start tarantool on install
* Don't restart tarantool on upgrade

Fix #2053

We don't pass the WAL error to the caller, so at least log it in the error
log.

Do not try to sync data range in case of write error in xlog_write_row().

Move fiber_pool struct to separate file. Prepare for detach fiber_pool
from cbus.

In order to rotate vinyl metadata log, we need to destroy the old xlog
and create a new one instead, so we can't embed the xlog structure in
vy_log. Let's store a pointer to xlog in vy_log instead.

* Remove "raw" comparators and dead code
* Fix inlining of comparison function
* Switch vinyl to specialized code from tuple_compare.cc
* Improve comments and minor renames

Prepare for #2046 and #2048

Remove struct vy_stmt * -> char * -> struct vy_stmt * conversion
from vy_task_compact_new().

We use ev_time() everywhere except xlog_init(), the latter uses ev_now()
for some reason. This prevents xlog from being created/opened from a
coeio task. Fix this.

* move cbus declaration to cbus.c, since going forward
  it's a private singleton
* rename cbus_item to cbus_endpoint. It represents the state
  of a single cord in the cbus (but in the future, a single cord
  may have more than one endpoint.
* move declaration of cbus_endpoint to cbus.c
* factor out cbus_find_endpoint()
* add/update comments
* move cbus_init()/cbus_free() to main.cc
* replace pthread_cond_signal() with pthread_cond_broadcast(),
  since in theory there can be many waiters on an endpoint
  to join.

Now we can create one-direction cbus connections and each cbus consumer
can have more than one producers. cbus_join will connect cord to cbus
with given name and cpipe_create will create a route to corresponding
destination

Fixes #2036

This is pure refactoring. No functional changes intended.

Closes #1811

Convert requeset.cc to request.c (plain C) to make
request_normalize_ops() callable from C. Move all prepareatory
work from Vinyl_Space::executeUpsert() to vy_upsert() to make
vy_upsert() callable from other contexts.

Encapsulate vy_insert() in vy_replace(), to make vy_replace()
a single entry point to all kinds of replaces. This is necessary
to make vy_replace() easily usable in other contexts.

Remove VinylEngine::recovery_complete, which was fully
dependent on vy_env::status. Provide public access to
vy_env::status.

In preparation for folding of memtx_replace_build_next() in scope
of recovery refactoring, mvoe all replace functions to memtx_space.cc

No semantical changes.

Don't count snapshot rows when recovering bootstrap.snap.
Add a comment to memtx_add_primary_key()

In case of multi-level compaction, we compact and hence delete not all
runs, so we must not delete the runs left on the list from the metadata
log, but we do now. This breaks recovery. Fix this.

Add error injection for vinyl schedule timeout. Used for vinyl
error injection tests.

New test for vinyl checkpoint

Before dumping or compacting a range, consider coalescing it with its
neighbors. Only coalesce two adjacent ranges if the total size of disk
space and in-memory data occupied by them is <= range_size / 2, to avoid
split-coalesce oscillations.

Closes #1735

Rename tuple.cc, tuple_convert.cc, tuple_format.cc

No semantic changes.

* Re-order code in tuple.h, tuple_format.h and key_def.h
* Add _xc prefixes to tuple.h functions
* Fix an unchecked exception in box_tuple_iterator()

Closes #2038