Juniper use lexer mode to handle dotted ASN in more places

[arifogel]

Use mode after:

• autonomous-system
• local-as
• peer-as

[batfish-bot]

This change is 

[dhalperi]

Reviewed 6 of 6 files at r1, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @corinaminer and @sfraint)

[codecov]

Codecov Report

Merging #8227 (e23d7fa) into master (ec69c7f) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #8227      +/-   ##
============================================
- Coverage     74.55%   74.54%   -0.01%     
- Complexity    43658    43659       +1     
============================================
  Files          3400     3401       +1     
  Lines        169262   169295      +33     
  Branches      20224    20224              
============================================
+ Hits         126188   126206      +18     
- Misses        33512    33521       +9     
- Partials       9562     9568       +6     

Impacted Files	Coverage Δ
.../datamodel/routing_policy/statement/Statement.java	72.72% <0.00%> (-9.10%)	⬇️
...fish/bddreachability/BDDLoopDetectionAnalysis.java	83.82% <0.00%> (-2.95%)	⬇️
...col/src/main/java/org/batfish/role/InferRoles.java	91.36% <0.00%> (-1.37%)	⬇️
...bddreachability/BDDReachabilityGraphOptimizer.java	82.82% <0.00%> (-1.02%)	⬇️
...ain/java/org/batfish/storage/FileBasedStorage.java	85.47% <0.00%> (-0.62%)	⬇️
...src/main/java/org/batfish/coordinator/WorkMgr.java	75.81% <0.00%> (-0.16%)	⬇️
.../org/batfish/dataplane/ibdp/BgpRoutingProcess.java	83.67% <0.00%> (-0.09%)	⬇️
...l/src/main/java/org/batfish/datamodel/UdpPort.java	93.93% <0.00%> (ø)
...tfish/representation/cisco/CiscoConfiguration.java	84.83% <0.00%> (+0.14%)	⬆️