Fixes #477 - ignore shared VPC resources and dedicated/host EC2 instances

[jantman]

This fixes #477

[codecov-commenter]

Codecov Report

Merging #484 into develop will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##           develop      #484   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           40        40           
  Lines         2860      2878   +18     
  Branches       438       441    +3     
=========================================
+ Hits          2860      2878   +18     

Impacted Files	Coverage Δ
awslimitchecker/checker.py	100.00% <ø> (ø)
awslimitchecker/services/base.py	100.00% <100.00%> (ø)
awslimitchecker/services/ec2.py	100.00% <100.00%> (ø)
awslimitchecker/services/vpc.py	100.00% <100.00%> (ø)

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