cs_network: Fix constraints for creating a private network

[resmo]

No description provided.

[codecov]

Codecov Report

Merging #54 (0ce7f59) into master (2859ce0) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #54      +/-   ##
==========================================
+ Coverage   84.32%   84.37%   +0.04%     
==========================================
  Files          53       53              
  Lines        5512     5510       -2     
  Branches     1247     1247              
==========================================
+ Hits         4648     4649       +1     
+ Misses        433      432       -1     
+ Partials      431      429       -2     

Impacted Files	Coverage Δ
plugins/modules/cs_network.py	80.76% <ø> (-0.30%)	⬇️
plugins/module_utils/cloudstack.py	72.58% <0.00%> (-0.23%)	⬇️
plugins/modules/cs_instance.py	71.52% <0.00%> (+0.68%)	⬆️
plugins/modules/cs_router.py	61.98% <0.00%> (+0.82%)	⬆️

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