Juniper: convert BGP confederation config

[progwriter]

No description provided.

[batfish-bot]

This change is 

[corinaminer]

Reviewed 7 of 7 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @dhalperi)

[codecov]

Codecov Report

Merging #4960 into master will increase coverage by <.01%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##             master    #4960      +/-   ##
============================================
+ Coverage     76.56%   76.56%   +<.01%     
  Complexity    29839    29839              
============================================
  Files          2384     2384              
  Lines        115079   115085       +6     
  Branches      13604    13605       +1     
============================================
+ Hits          88106    88112       +6     
+ Misses        20297    20294       -3     
- Partials       6676     6679       +3

Impacted Files	Coverage Δ	Complexity Δ
...fish/grammar/flatjuniper/ConfigurationBuilder.java	63.35% <ø> (-0.02%)	720 <0> (ø)
...rc/main/java/org/batfish/datamodel/BgpProcess.java	89.36% <100%> (+0.23%)	32 <1> (+1)	⬆️
...h/representation/juniper/JuniperConfiguration.java	88.66% <80%> (-0.03%)	414 <0> (+1)
...org/batfish/datamodel/flow/BidirectionalTrace.java	81.81% <0%> (-2.28%)	14% <0%> (-1%)
...src/main/java/org/batfish/coordinator/PoolMgr.java	64.04% <0%> (-1.13%)	15% <0%> (-1%)
...tfish/representation/cisco/CiscoConfiguration.java	84.12% <0%> (+0.12%)	510% <0%> (+1%)	⬆️