Task input validators

[nbrouand]

Issue Number

fixes #585
fixes #577

Describe the changes you've made

I have also add target properties to kafka publish task (asked by @iguissouma

Checklist

• Refer to issue(s) the PR solves
• New java code is covered by tests
• All new and existing tests pass
• No git conflict

[codecov-commenter]

Codecov Report

Merging #584 (372ad05) into master (4933f27) will decrease coverage by 0.90%.
The diff coverage is 54.52%.

@@             Coverage Diff              @@
##             master     #584      +/-   ##
============================================
- Coverage     74.02%   73.11%   -0.91%     
- Complexity     3405     3410       +5     
============================================
  Files           629      634       +5     
  Lines         14746    14888     +142     
  Branches        864      859       -5     
============================================
- Hits          10915    10886      -29     
- Misses         3386     3560     +174     
+ Partials        445      442       -3     

Impacted Files	Coverage Δ
...m/chutneytesting/task/amqp/QpidServerStopTask.java	0.00% <0.00%> (ø)
...tneytesting/task/assertion/JsonValidationTask.java	58.33% <0.00%> (-24.02%)	⬇️
...m/chutneytesting/task/assertion/XmlAssertTask.java	78.84% <0.00%> (-4.83%)	⬇️
...chutneytesting/task/assertion/utils/JsonUtils.java	22.22% <ø> (ø)
...ava/com/chutneytesting/task/context/SleepTask.java	0.00% <0.00%> (ø)
...om/chutneytesting/task/function/JsonFunctions.java	40.00% <ø> (ø)
...ava/com/chutneytesting/task/http/HttpSoapTask.java	0.00% <0.00%> (ø)
...a/com/chutneytesting/task/http/HttpTaskHelper.java	0.00% <0.00%> (ø)
.../chutneytesting/task/http/HttpsServerStopTask.java	0.00% <0.00%> (ø)
...com/chutneytesting/task/jms/JmsBrokerStopTask.java	0.00% <0.00%> (ø)
... and 72 more

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