Arista BGP: evpn AF allow-remote-as-out

[progwriter]

Should always be set to true, just like for IPv4 AF

[batfish-bot]

This change is 

[codecov]

Codecov Report

Merging #5365 into master will decrease coverage by <.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master    #5365      +/-   ##
============================================
- Coverage     73.31%    73.3%   -0.01%     
+ Complexity    32033    32028       -5     
============================================
  Files          2623     2623              
  Lines        129154   129154              
  Branches      15533    15533              
============================================
- Hits          94683    94671      -12     
- Misses        26954    26964      +10     
- Partials       7517     7519       +2

Impacted Files	Coverage Δ	Complexity Δ
...atfish/representation/cisco/AristaConversions.java	73.62% <100%> (ø)	70 <0> (ø)	⬇️
...c/main/java/org/batfish/dataplane/rib/RibTree.java	89.58% <0%> (-4.17%)	27% <0%> (-1%)
...col/src/main/java/org/batfish/role/InferRoles.java	89.54% <0%> (-1.37%)	50% <0%> (-1%)
...java/org/batfish/dataplane/ibdp/VirtualRouter.java	87.93% <0%> (-0.32%)	261% <0%> (-2%)
...batfish/src/main/java/org/batfish/main/Driver.java	38.07% <0%> (-0.26%)	28% <0%> (ø)
...tfish/representation/cisco/CiscoConfiguration.java	85.6% <0%> (-0.13%)	524% <0%> (-1%)

[dhalperi]

Reviewed 2 of 2 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved