Allow network whitelisting on the service level

[beastawakens]

I think this syntax is correct but I'd recommend some manual testing of this, just to be sure!

[codecov[bot]]

Codecov Report

Base: 36.19% // Head: 36.22% // Increases project coverage by +0.02% :tada:

Coverage data is based on head (ae88e4f) compared to base (e087555). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3581      +/-   ##
==========================================
+ Coverage   36.19%   36.22%   +0.02%     
==========================================
  Files         168      168              
  Lines       18413    18418       +5     
==========================================
+ Hits         6665     6672       +7     
+ Misses      10616    10613       -3     
- Partials     1132     1133       +1     

Impacted Files	Coverage Δ
pkg/manifest/service.go	41.02% <ø> (ø)
provider/aws/template.go	0.00% <0.00%> (ø)
pkg/logstorage/logstorage.go	87.91% <0.00%> (+7.69%)	:arrow_up:

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[heronrs]

@beastawakens if you could also create some tests to assert this new functionality we would greatly appretiate