GUI-1137 and GUI-1182: Fix import keypair and change password text inputs on IE

The import key pair and change password inputs on IE don't allow text input due to an errant maxlength attribute on the form inputs (with source of the attribute unknown).  The fix is to remove the errant attribute in those inputs.

Fixes https://eucalyptus.atlassian.net/browse/GUI-1137 and https://eucalyptus.atlassian.net/browse/GUI-1182