test: flaky engine_long/delete_replace_update.test.lua test needs more time to run

[avtikhon]

Tarantool version:
| Tarantool 2.7.0-74-g6ad720d6d6
| Target: Linux-x86_64-Debug
| Build options: cmake . -DCMAKE_INSTALL_PREFIX=/usr/local -DENABLE_BACKTRACE=ON
| Compiler: /usr/bin/cc /usr/bin/c++
| C_FLAGS: -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -fopenmp -msse2 -fprofile-arcs -ftest-coverage -std=c11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-gnu-alignof-expression -fno-gnu89-inline -Wno-cast-function-type -Werror
| CXX_FLAGS: -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -fopenmp -msse2 -fprofile-arcs -ftest-coverage -std=c++11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-invalid-offsetof -Wno-gnu-alignof-expression -Wno-cast-function-type -Werror

OS version:
Debian 9/CentOS 7 (debug and OOS builds)

Bug description:
Seems that test needs more time to run in debug and OOS builds.

https://gitlab.com/tarantool/tarantool/-/jobs/874618162#L5197

artifacts.zip

results file checksum: a4203ec9b3ed711aceb0944259de79ce

results file checksum: 7a2e5c3cd2500fb7ce232a9ce93be628

results file checksum: 87a84fe5ec49e15981dd52d7cfaea22e

[022] engine_long/delete_replace_update.test.lua      memtx           Test timeout of 170 secs reached	[ fail ]
[022] 
[022] Test failed! Result content mismatch:
[022] --- engine_long/delete_replace_update.result	Wed Jul 22 06:13:45 2020
[022] +++ var/rejects/engine_long/delete_replace_update.reject	Thu Nov 26 19:08:02 2020
[022] @@ -48,9 +48,3 @@
[022]  ---
[022]  ...
[022]  delete_replace_update(engine_name, iterations)
[022] ----
[022] -- - 100000
[022] -  - 3
[022] -  - LCUFGMXHLNHJBAQJDHGH
[022] -  - HKBELZCRRWNZHFIRAHJD
[022] -...
[022] 

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat

[Totktonada]

Hits me locally on 2.8.0-21-gfc86213cd.