integration_test: split tests into separate files

[ahmetb]

Fixes #229.

[ahmetb]

/assign @corneliusweig

[corneliusweig]

/lgtm
/approve

[corneliusweig]

/approve cancel

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[corneliusweig]

/lgtm cancel
Realized that CI had not finished.

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@@           Coverage Diff            @@
##             master    #240   +/-   ##
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  Coverage          ?   53.6%           
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  Files             ?      16           
  Lines             ?     735           
  Branches          ?       0           
========================================
  Hits              ?     394           
  Misses            ?     289           
  Partials          ?      52

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[corneliusweig]

/lgtm