Arista BGP default-originate route-map

[corinaminer]

In the line:
neighbor 10.1.1.2 default-originate route-map ROUTE_MAP
Cisco uses ROUTE_MAP as a generation policy, but Arista instead applies it to the (unconditionally) exported default route (see Arista's documentation and notes from GNS3 for details). Currently Batfish always converts the route-map to a generation policy. This PR makes it add the route-map to the default route export policy instead if on an Arista device.

The default route export policy can now vary per peer again, so we're back to creating one default route export policy per default-originating peer, except for NXOS, which still creates one default route export policy per config.

[batfish-bot]

This change is 

[codecov]

Codecov Report

Merging #3696 into master will decrease coverage by 0.01%.
The diff coverage is 84.84%.

@@             Coverage Diff              @@
##             master    #3696      +/-   ##
============================================
- Coverage     73.82%    73.8%   -0.02%     
+ Complexity    24836    24830       -6     
============================================
  Files          2118     2118              
  Lines        101662   101673      +11     
  Branches      12010    12013       +3     
============================================
- Hits          75047    75038       -9     
- Misses        21257    21273      +16     
- Partials       5358     5362       +4

Impacted Files	Coverage Δ	Complexity Δ
...tfish/representation/cisco/CiscoNxConversions.java	82.41% <100%> (ø)	39 <1> (ø)	⬇️
...tfish/representation/cisco/CiscoConfiguration.java	83.8% <75%> (-0.13%)	530 <1> (+2)
...batfish/representation/cisco/CiscoConversions.java	90.41% <89.47%> (+0.06%)	147 <3> (+1)	⬆️
...c/main/java/org/batfish/dataplane/rib/RibTree.java	78.72% <0%> (-10.64%)	23% <0%> (-1%)
.../src/main/java/org/batfish/datamodel/flow/Hop.java	53.33% <0%> (-6.67%)	5% <0%> (-1%)
...g/batfish/datamodel/acl/IpAccessListLineIndex.java	33.33% <0%> (-5.56%)	4% <0%> (-1%)
...rc/main/java/org/batfish/datamodel/flow/Trace.java	87.09% <0%> (-3.23%)	11% <0%> (-2%)
...org/batfish/datamodel/flow/BidirectionalTrace.java	81.81% <0%> (-2.28%)	14% <0%> (ø)
...col/src/main/java/org/batfish/role/InferRoles.java	91.01% <0%> (-1.18%)	69% <0%> (-1%)
...src/main/java/org/batfish/coordinator/PoolMgr.java	64.04% <0%> (-1.13%)	15% <0%> (-1%)
... and 2 more

[progwriter]

Reviewed 7 of 7 files at r1, 2 of 2 files at r2.
Reviewable status: complete! all files reviewed, all discussions resolved

---

projects/batfish/src/test/java/org/batfish/grammar/cisco/CiscoGrammarTest.java, line 718 at r1 (raw file):

    BgpRoute expectedDefaultRoute =
        BgpRoute.builder()
            .setCommunities(ImmutableSet.of(7274718L, 21823932L))

darn it, creating more work for me 😛