CiscoGenericParser: normalize to Port-channel

[dhalperi]

IOS and IOS-XE, at least recent releases, normalize this way.

Arista is Port-Channel, but has been factored out.
NX-OS is port-channel.

Since we've moved those out, we can do this change.

Fixes a user complaint from Marek Zbroch of NTC on Slack.

[batfish-bot]

This change is 

[codecov]

Codecov Report

Merging #6104 into master will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #6104      +/-   ##
============================================
- Coverage     72.72%   72.71%   -0.01%     
+ Complexity    34650    34642       -8     
============================================
  Files          2815     2815              
  Lines        141272   141271       -1     
  Branches      16964    16964              
============================================
- Hits         102737   102724      -13     
- Misses        30374    30379       +5     
- Partials       8161     8168       +7     

Impacted Files	Coverage Δ	Complexity Δ
...src/main/java/org/batfish/datamodel/Interface.java	83.71% <100.00%> (ø)	221.00 <0.00> (ø)
...fish/grammar/cisco/CiscoControlPlaneExtractor.java	65.21% <100.00%> (+0.01%)	1189.00 <0.00> (ø)
...tfish/representation/cisco/CiscoConfiguration.java	85.94% <100.00%> (ø)	493.00 <0.00> (ø)
...va/org/batfish/representation/cisco/Interface.java	88.62% <100.00%> (ø)	115.00 <0.00> (ø)
...g/batfish/datamodel/flow/IncomingSessionScope.java	84.61% <0.00%> (-15.39%)	7.00% <0.00%> (-1.00%)
.../org/batfish/dataplane/rib/RouteAdvertisement.java	84.78% <0.00%> (-4.35%)	16.00% <0.00%> (-1.00%)
...c/main/java/org/batfish/dataplane/rib/RibTree.java	89.58% <0.00%> (-4.17%)	27.00% <0.00%> (-1.00%)
...col/src/main/java/org/batfish/role/InferRoles.java	89.54% <0.00%> (-1.37%)	50.00% <0.00%> (-1.00%)
...src/main/java/org/batfish/coordinator/PoolMgr.java	59.25% <0.00%> (-1.24%)	15.00% <0.00%> (-1.00%)
...a/org/batfish/representation/aws/LoadBalancer.java	82.18% <0.00%> (-0.32%)	70.00% <0.00%> (-1.00%)
... and 1 more

[progwriter]

Reviewed 8 of 8 files at r1.
Reviewable status: complete! all files reviewed, all discussions resolved