EUCA-7876
added proper validation and error message for name field.
EUCA-7876
now perform additional validation check on submit
The error message needs to be in red and displayed under the inputbox.
Matching the AWS image name constratins description directly from the AWS document.
Merge branch 'maint/3.4/testing' into EUCA-7876
Changing the constraints on 'name' attribute to 'image_name'
Merge pull request #186 from eucalyptus/EUCA-7876

EUCA-7876