[Assistant] Add newest generated code

[lpatino10]

This PR adds the latest changes in the Assistant service as of 4/17/18.

[codecov-io]

Codecov Report

Merging #920 into develop will increase coverage by 0.05%.
The diff coverage is 33.33%.

@@              Coverage Diff              @@
##             develop     #920      +/-   ##
=============================================
+ Coverage      38.79%   38.84%   +0.05%     
- Complexity      1407     1414       +7     
=============================================
  Files            559      559              
  Lines          14196    14199       +3     
  Branches         825      825              
=============================================
+ Hits            5507     5516       +9     
+ Misses          8373     8367       -6     
  Partials         316      316

Impacted Files	Coverage Δ	Complexity Δ
...r_cloud/assistant/v1/model/ListIntentsOptions.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...er_cloud/assistant/v1/model/ListValuesOptions.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...oper_cloud/assistant/v1/model/MessageResponse.java	73.68% <ø> (ø)	2 <0> (ø)	⬇️
..._cloud/assistant/v1/model/ListExamplesOptions.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...oud/assistant/v1/model/ListDialogNodesOptions.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...r_cloud/assistant/v1/model/ListAllLogsOptions.java	68.75% <ø> (ø)	5 <0> (ø)	⬇️
...assistant/v1/model/ListCounterexamplesOptions.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...loud/assistant/v1/model/ListWorkspacesOptions.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...developer_cloud/assistant/v1/model/DialogNode.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...loper_cloud/assistant/v1/model/MessageRequest.java	0% <ø> (ø)	0 <0> (ø)	⬇️
... and 9 more

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