AWS layer1 (with no file written on empty layer1)

[ratulm]

@progwriter - only the last commit has new changes

[batfish-bot]

This change is 

[codecov]

Codecov Report

Merging #5173 into master will increase coverage by 0.02%.
The diff coverage is 92.37%.

@@             Coverage Diff              @@
##             master    #5173      +/-   ##
============================================
+ Coverage     73.33%   73.35%   +0.02%     
- Complexity    31596    31623      +27     
============================================
  Files          2590     2591       +1     
  Lines        127279   127356      +77     
  Branches      15262    15267       +5     
============================================
+ Hits          93335    93421      +86     
+ Misses        26631    26622       -9     
  Partials       7313     7313

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/org/batfish/representation/aws/Vpc.java	70.83% <ø> (ø)	7 <0> (ø)	⬇️
...ava/org/batfish/representation/aws/NatGateway.java	42.85% <ø> (ø)	5 <0> (ø)	⬇️
...ava/org/batfish/representation/aws/VpnGateway.java	83.6% <ø> (ø)	11 <0> (ø)	⬇️
...rg/batfish/representation/aws/InternetGateway.java	82.14% <ø> (ø)	10 <0> (ø)	⬇️
.../org/batfish/representation/aws/VpnConnection.java	70.89% <ø> (ø)	25 <0> (ø)	⬇️
...n/java/org/batfish/vendor/VendorConfiguration.java	98.13% <100%> (+0.01%)	49 <1> (+1)	⬆️
...in/java/org/batfish/representation/aws/Subnet.java	76.43% <100%> (+0.3%)	32 <2> (+2)	⬆️
...java/org/batfish/common/topology/TopologyUtil.java	92.64% <100%> (+0.14%)	141 <9> (+2)	⬆️
...in/java/org/batfish/representation/aws/Region.java	91.23% <100%> (ø)	96 <0> (ø)	⬇️
...ain/java/org/batfish/storage/FileBasedStorage.java	83.05% <100%> (+0.54%)	136 <4> (+5)	⬆️
... and 17 more

[progwriter]

did a RN build, looks ok.

Reviewed 26 of 29 files at r1, 3 of 3 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dhalperi)