Make submit button type 'submit' [#159312547]
Make submit button type 'submit' [#159312547]

Signed-off-by: Ming Xiao <fde61075b779168f6585a9760a4f9e9e08423562@pivotal.io>

pivotal-cf/pivotal-ui,pivotal-cf/pivotal-ui,pivotal-cf/pivotal-ui