Make test-run framework run tests successfully against installed tarantool packages

[Nick Volynkin]

tarantool/test-run should be able to run tests successfully against an installed tarantool package, that is, with tarantool binary in any path.

[Yaroslav Lobankov]

Actually, we don't need to make any changes in test-run. To make tests work against tarantool installed from a package we just need to build unit test binaries and libs for functional tests before starting test-run. Also, we need to fix some tests like test/app-tap/gh-1700-abort-recording-on-fiber-switch.test.lua, test/app-tap/tarantoolctl.test.lua, test/box-py/args.test.py because they rely on some stuff from the tarantool build dir.

[Yaroslav Lobankov]

Unit tests and small tests can be built in such a way:

cmake .
make -j -C test/unit
make -j -C test/small

and run by cd test && ./test-run.py unit/ small/.

For building all tests (unit, small, and functional):

cmake .
make -j -C test