sqliterepo/election: Be more consistent with sharded/multiplied ZK

[jfsmig]

SUMMARY

Allow to change the value of the value of the managed variable sqliterepo.zk.mux_factor on a running platform. Only works for platforms that never used a positive value prior to this PR, because it was not possible to modify that value without breaking the election FSM.

ISSUE TYPE

enhancement

COMPONENT NAME

sqliterepo

SDS VERSION

openio 4.4.0.0b1.dev80

[fvennetier]

Please do not mention my name in your commit messages.

[codecov-io]

Codecov Report

Merging #1696 into master will increase coverage by 0.12%.
The diff coverage is 39.14%.

@@            Coverage Diff             @@
##           master    #1696      +/-   ##
==========================================
+ Coverage   79.53%   79.65%   +0.12%     
==========================================
  Files         369      369              
  Lines       67978    68351     +373     
  Branches     6846     6880      +34     
==========================================
+ Hits        54061    54436     +375     
+ Misses      13811    13809       -2     
  Partials      106      106

Impacted Files	Coverage Δ
sqliterepo/election.c	88.74% <39.14%> (-0.5%)	⬇️
oio/conscience/client.py	79.75% <0%> (-5.96%)	⬇️
oio/account/client.py	81.61% <0%> (-5.74%)	⬇️
tests/functional/cli/account/test_account.py	23.46% <0%> (-1.54%)	⬇️
oio/common/utils.py	66.99% <0%> (-1.3%)	⬇️
oio/blob/indexer.py	70.46% <0%> (-1.19%)	⬇️
oio/directory/meta1.py	88.51% <0%> (-1.14%)	⬇️
oio/common/storage_functions.py	91.43% <0%> (-0.71%)	⬇️
oio/ecd/app.py	65.48% <0%> (-0.59%)	⬇️
sqlx/sqlx_service.c	84.43% <0%> (-0.51%)	⬇️
... and 47 more

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