Removed the Add User button flickering issue
Merge branch 'GUI-1046-merge' into GUI-1053

Conflicts:
	eucaconsole/static/js/widgets/user_editor.js
Switched to use direct regex-based validation using JS to make the interaction more responsive
Clean up the unneeded lines in user_editor.js
Handled the issue when a space is typed for the last char of username
Merge pull request #789 from eucalyptus/GUI-1053

Gui 1053 Remove the add user button flickering issue