[gwt-contrib] Public: Move the validation metadata classes to client/metadata. (issue773801)

[nchalko]

Reviewers: robertvawter,

Description:
Public: Move the validation metadata classes to client/metadata.

Please review this at http://gwt-code-reviews.appspot.com/773801/show

Affected files:
  A  
user/src/com/google/gwt/validation/client/metadata/ConstraintDescriptorImpl.java
  D  
user/src/com/google/gwt/validation/metadata/ConstraintDescriptorImpl.java


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