V5 logs should return rfc3339 time format

[srijeet0406]

This PR is not related to any issue. It fixes the timestamp for the logs api in version 5.0.

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Which Traffic Control components are affected by this PR?

• Documentation
• Traffic Ops

What is the best way to verify this PR?

Make sure all the tests pass.
Hit the logs api on version 5.0 and make sure that the timestamps being returned are in rfc3339 format.

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 #7690 (0789a5f) into master (2233d22) will increase coverage by 2.57%.
Report is 15 commits behind head on master.
The diff coverage is 6.06%.

@@             Coverage Diff              @@
##             master    #7690      +/-   ##
============================================
+ Coverage     27.20%   29.78%   +2.57%     
  Complexity       98       98              
============================================
  Files           686      802     +116     
  Lines         79755    85784    +6029     
  Branches         90      952     +862     
============================================
+ Hits          21701    25552    +3851     
- Misses        55984    58094    +2110     
- Partials       2070     2138      +68     

Flag	Coverage Δ
golib_unit	48.05% <0.00%> (-0.22%)	⬇️
grove_unit	4.60% <ø> (ø)
t3c_unit	4.95% <ø> (ø)
traffic_monitor_unit	21.30% <ø> (ø)
traffic_ops_integration	69.39% <100.00%> (ø)
traffic_ops_unit	22.28% <0.00%> (-0.41%)	⬇️
traffic_portal_v2	73.71% <ø> (?)
traffic_stats_unit	10.14% <ø> (ø)
unit_tests	26.94% <0.00%> (+3.04%)	⬆️
v3	57.79% <ø> (ø)
v4	79.18% <ø> (ø)
v5	78.52% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
lib/go-tc/log.go	0.00% <0.00%> (ø)
traffic_ops/traffic_ops_golang/logs/log.go	0.00% <0.00%> (ø)
traffic_ops/v5-client/log.go	100.00% <100.00%> (ø)

... and 122 files with indirect coverage changes

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[kdamichie]

Looks good - Approved