PAN: fix NAT addresses reference tracking

[sfraint]

Fix address references from NAT rules.

Also add a broader test for references from NAT rules.

[batfish-bot]

This change is 

[dhalperi]

Reviewed 3 of 3 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @arifogel)

[dhalperi]

Reviewed 2 of 2 files at r2, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @arifogel)

[codecov]

Codecov Report

Merging #8367 (72c451f) into master (955ad65) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #8367      +/-   ##
============================================
- Coverage     74.73%   74.72%   -0.02%     
+ Complexity    44023    44017       -6     
============================================
  Files          3419     3419              
  Lines        170084   170080       -4     
  Branches      20290    20289       -1     
============================================
- Hits         127108   127088      -20     
- Misses        33376    33390      +14     
- Partials       9600     9602       +2     

Impacted Files	Coverage Δ
...epresentation/palo_alto/PaloAltoConfiguration.java	90.46% <ø> (+0.30%)	⬆️
.../datamodel/routing_policy/statement/Statement.java	72.72% <0.00%> (-9.10%)	⬇️
...src/main/java/org/batfish/coordinator/PoolMgr.java	55.95% <0.00%> (-3.58%)	⬇️
...col/src/main/java/org/batfish/role/InferRoles.java	91.36% <0.00%> (-1.37%)	⬇️
...ain/java/org/batfish/storage/FileBasedStorage.java	86.00% <0.00%> (-0.60%)	⬇️
...ain/java/org/batfish/coordinator/WorkQueueMgr.java	70.93% <0.00%> (-0.59%)	⬇️
...src/main/java/org/batfish/coordinator/WorkMgr.java	76.02% <0.00%> (-0.37%)	⬇️
...rg/batfish/dataplane/ibdp/EigrpRoutingProcess.java	89.08% <0.00%> (-0.36%)	⬇️
...java/org/batfish/dataplane/ibdp/VirtualRouter.java	87.56% <0.00%> (-0.25%)	⬇️
...tfish/representation/cisco/CiscoConfiguration.java	84.78% <0.00%> (-0.15%)	⬇️
... and 4 more