test: fix the use of before_all/after_all hooks

[ochaplashkin]

Changed the work with hooks in the part of tests. The all changes were made in manual mode with automatic control of the grep utility and manual review.

What has changed

Some tests contain a legacy approach:

g.before_all = function() ... end
g.after_all = function() ... end

The logic of executing hooks will be expected and more controlled if use following approach:

g.before_all(function() ... end)
g.after_all(function() ... end)

Proof that all matches were changed

Before fixing

$ grep -r 'g.before_all =' --include='*_test.lua' . | wc -l
43
$ grep -r 'g.after_all =' --include='*_test.lua' . | wc -l
42

After fixing

$ grep -r 'g.before_all =' --include='*_test.lua' . | wc -l
0
$ grep -r 'g.after_all =' --include='*_test.lua' . | wc -l
0
$ grep -r 'g.before_each =' --include='*_test.lua' . | wc -l
0
$ grep -r 'g.after_each =' --include='*_test.lua' . | wc -l
0
$ grep -r 'g.before_test =' --include='*_test.lua' . | wc -l
0
$ grep -r 'g.after_test =' --include='*_test.lua' . | wc -l
0

Manual search using grep on different regex was done too.

Resolve #8066

[coveralls]

Coverage: 85.479% (-0.01%) from 85.492% when pulling 8b95ce0 on ochaplashkin:fix-usage-before-after-all-hooks into 895cb2d
on tarantool:master.

[ylobankov]

Cherry picked to 2.10 and 1.10.