Output delimiter to the result file if it is present.

Patch by Eugine Blikh.

	a. `setopt delim '<delim>'`
	b. open for ideas
2. Move all test to support delim ';'
3. Move memcached/lua.test.py -> memcached/lua.test.lua
4. Fix some typos

Returning tests to their previous place. Fixing error in tarantool_connection, that prevernts reconnection. Fixing bug in cas.test

calls.

Use beginBuild(), reserve(), endBuild() to implement Index::build().
This is a pre-requisite for the refactoring of the
recovery API to make recovery of data dictionary spaces more
straightforward.

A pre-requisite patch for data dictionary: sotre index
ordinal number in the key_def object.
Remove struct space from index constructor.

1) Lua Tarantool Server, that runs plain lua code and admin server commands (separated ';\n')
2) Python Tarantool Server, that runs old plain tests.
Also created Two types of tests, that inherit FuncTest (Cause they're FuncTest):
1) LuaTest -> Lua Tarantool Server
2) PythonTest -> Python Tarantool Server
In the future we plans to add luabench as one of Test types
Rename all cores to appropriate names of server (now it's 'lua tarantool' and 'python tarantool')
Prepare to remove lua prefixes (if you need to test wrong or nonimplemmented command you may run 'admin('cmd', simple=True)')
If you want to implement new server command - add needed regexp to admin_connection.py.
if it's fixed length command, then add it to rg1, else rg2

Incompatible change,
https://blueprints.launchpad.net/tarantool/+spec/cardinality-arity

cardinality is how many unique elements a set contains. wrong term
for the max number of fields in a tuple

https://bugs.launchpad.net/tarantool/+bug/1200228
Remove the regression I introduced when trying to be to smart when
comparing integer numbers.

Numeric comparison is not memcmp compatible on x86, and I don't
know what I was smoking when I wrote a test which proved it wrong.

1) Remove debug output
2) Add --gdb description
3) Return [self.binary]

Add forgotten tarantool error.

1) Moving ./test-run.py --gdb from xterm (or another standart X terminal emulator) to detached Screen session
2) Moving from unnecessary dependency "pexpect" to builtin "subprocess" module.

Move struct key_def into an own header.
Rename key_def methods to follow the coding style.
Rename field_data_type to field_type.
Instead of panicking on key_def initialization
error, throw an exception.