GUI-846: Warn of policy name conflict in IAM policy generator on form submit rather than on policy name entry.  Add validation pattern for IAM policy names, which cannot contain spaces.
fixed capital letter in button text (in sentence case, the word "the" should not be capitalized)
Merge pull request #661 from eucalyptus/GUI-846

GUI-846: Warn of policy name conflict in IAM policy generator on form submit rather than on policy name entry