Fix TPv2 e2e ciab container and add config file

[shamrickus]

This PR fixes an issue with the TPv2 e2e container. It also adds a config file to nightwatch such that it can be edited instead of manually editing source files and jq can be used. It also adds some timeout options to the nightwatch conf that are set to the default values for the purpose of modifying if any CI systems need longer timeouts.

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Which Traffic Control components are affected by this PR?

• Traffic Portal v2
• CDN in a Box

What is the best way to verify this PR?

Run the TPv2 e2e container and verify that it succeeds.

If this is a bugfix, which Traffic Control versions contained the bug?

• master

PR submission checklist

• This PR has tests
• This PR has documentation
• This PR has a CHANGELOG.md entry
• This PR DOES NOT FIX A SERIOUS SECURITY VULNERABILITY (see the Apache Software Foundation's security guidelines for details)

[codecov]

Codecov Report

Merging #7440 (d534ff8) into master (096ef2a) will increase coverage by 31.83%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             master    #7440       +/-   ##
=============================================
+ Coverage     29.22%   61.05%   +31.83%     
  Complexity       98       98               
=============================================
  Files           781      302      -479     
  Lines         81527    11535    -69992     
  Branches        779      779               
=============================================
- Hits          23826     7043    -16783     
+ Misses        55653     4146    -51507     
+ Partials       2048      346     -1702     

Flag	Coverage Δ
golib_unit	?
grove_unit	?
t3c_unit	?
traffic_monitor_unit	?
traffic_ops_unit	?
traffic_portal_v2	64.24% <ø> (ø)
traffic_stats_unit	?
unit_tests	64.24% <ø> (+38.07%)	⬆️

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[zrhoffman]

Looks good, thanks!