Admin CLI improvements

[fvennetier]

SUMMARY

• Make variable names intelligible (no more one letter variables).
• Replace some assertions by exceptions, with messages telling what is wrong.

Jira: OS-491

ISSUE TYPE

• Feature Pull Request
• Bugfix Pull Request

COMPONENT NAME

• CLI

SDS VERSION

openio 5.3.0.0b1.dev14

[codecov-io]

Codecov Report

Merging #1994 into 5.x will increase coverage by 16.87%.
The diff coverage is 64.52%.

@@             Coverage Diff             @@
##              5.x    #1994       +/-   ##
===========================================
+ Coverage   62.36%   79.23%   +16.87%     
===========================================
  Files         265      391      +126     
  Lines       54754    73980    +19226     
  Branches     6876     7027      +151     
===========================================
+ Hits        34144    58608    +24464     
+ Misses      20322    15133     -5189     
+ Partials      288      239       -49

Impacted Files	Coverage Δ
oio/cli/admin/service_check.py	72.05% <64.52%> (ø)
meta2v2/meta2_dedup_utils.c	18.56% <0%> (ø)	⬆️
tests/unit/api/test_ec.py	86.23% <0%> (ø)	⬆️
rawx-apache2/src/rawx_bucket.c	0% <0%> (ø)	⬆️
tests/unit/common/test_fullpath.py	100% <0%> (ø)	⬆️
sqlx/sqlx_server.c	78.95% <0%> (ø)	⬆️
tests/unit/api/test_objectstorage.py	98.33% <0%> (ø)	⬆️
oio/common/constants.py	100% <0%> (ø)	⬆️
tests/unit/common/test_exceptions.py	100% <0%> (ø)	⬆️
rawx-lib/src/compression.c	0% <0%> (ø)	⬆️
... and 340 more

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