fix: calculate cluster dns correctly for non /16 blocks

[backjo]

Closes #318
Signed-off-by: Jonah Back jonah@jonahback.com

[codecov]

Codecov Report

Merging #319 (b93e8b9) into master (a5c9617) will decrease coverage by 14.33%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           master     #319       +/-   ##
===========================================
- Coverage   70.24%   55.90%   -14.34%     
===========================================
  Files          19       27        +8     
  Lines        3186     4012      +826     
===========================================
+ Hits         2238     2243        +5     
- Misses        808     1628      +820     
- Partials      140      141        +1     

Impacted Files	Coverage Δ
controllers/providers/aws/eks.go	4.03% <100.00%> (ø)
controllers/providers/aws/ec2.go	0.00% <0.00%> (ø)
controllers/providers/aws/iam.go	0.00% <0.00%> (ø)
controllers/providers/aws/autoscaling.go	0.00% <0.00%> (ø)
controllers/providers/aws/predicates.go	0.00% <0.00%> (ø)
controllers/providers/aws/aws.go	0.00% <0.00%> (ø)
controllers/providers/aws/retry.go	0.00% <0.00%> (ø)
controllers/providers/aws/constructors.go	0.00% <0.00%> (ø)

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