Replacing Report Fragment with div

[timothymclane]

Issue:

What I did

Replaced usage of React.Fragment with div as discussed in #3370.

[codecov]

Codecov Report

Merging #3372 into master will not change coverage.
The diff coverage is 0%.

@@           Coverage Diff           @@
##           master    #3372   +/-   ##
=======================================
  Coverage   36.82%   36.82%           
=======================================
  Files         458      458           
  Lines       10033    10033           
  Branches      890      898    +8     
=======================================
  Hits         3695     3695           
+ Misses       5818     5808   -10     
- Partials      520      530   +10

Impacted Files	Coverage Δ
addons/a11y/src/components/Report/index.js	0% <0%> (ø)	⬆️
addons/storysource/src/loader/parse-helpers.js	46.75% <0%> (ø)	⬆️
app/angular/src/server/ts_config.js	38.09% <0%> (ø)	⬆️
addons/jest/src/components/Result.js	0% <0%> (ø)	⬆️
addons/storyshots/src/rn/loader.js	53.33% <0%> (ø)	⬆️
addons/knobs/src/components/types/Files.js	14.28% <0%> (ø)	⬆️
addons/storysource/src/loader/traverse-helpers.js	60.86% <0%> (ø)	⬆️
addons/storysource/src/loader/generate-helpers.js	44.44% <0%> (ø)	⬆️
addons/viewport/src/preview/components/Viewport.js	89.36% <0%> (ø)	⬆️
addons/knobs/src/components/GroupTabs.js	30.48% <0%> (ø)	⬆️
... and 57 more

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