Fix for TypeError in self-coordinator

[markovamaria]

Fix for "TypeError" (see below) includes replacement of exec_init_command function from redis-admin branch to similar (but newer) function in redis-benchmark-specification branch.
redis-* test syntax was aligned to others tests for passing CI rules

Error:

  File "/root/venv-redis/lib/python3.8/site-packages/redis_benchmarks_specification/__self_contained_coordinator__/self_contained_coordinator.py", line 560, in process_self_contained_coordinator_stream
    execute_init_commands(
  File "/root/venv-redis/lib/python3.8/site-packages/redisbench_admin/run/common.py", line 426, in execute_init_commands
    cmds = k["init_commands"]
TypeError: string indices must be integers

How to reproduce:

Run on testing host:

$ redis-benchmarks-spec-sc-coordinator --platform-name intel64-ubuntu20.04-biredis --event_stream_host benchmarks.redislabs.com --event_stream_port <redacted> --event_stream_pass <redacted> --event_stream_user default --datasink_push_results_redistimeseries --datasink_redistimeseries_host benchmarks.redislabs.com --datasink_redistimeseries_port 12011 --datasink_redistimeseries_pass <redacted> --logname /var/opt/test2.log --redis_proc_start_port 6379 --cpuset_start_pos 0 --docker-air-gap --consumer-id 1

In parallell run testing's triggering:

redis-benchmarks-spec-cli --use-branch --from-date 2023-03-22 --redis_port 12010 --redis_host benchmarks.redislabs.com --redis_pass ***

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (a4fa679) 56.74% compared to head (dd782cc) 56.76%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
+ Coverage   56.74%   56.76%   +0.01%     
==========================================
  Files          24       24              
  Lines        2224     2225       +1     
==========================================
+ Hits         1262     1263       +1     
  Misses        962      962              

Impacted Files	Coverage Δ
...tained_coordinator__/self_contained_coordinator.py	58.35% <ø> (ø)
...edis_benchmarks_specification/__common__/runner.py	84.70% <100.00%> (+0.18%)	⬆️

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[markovamaria]

Hi @filipecosta90 , please take a look

[filipecosta90]

Thank you @markovamaria ! Merging