Lower the testing nonce expiration to 5 seconds.

r912311 introduced programatically generated OTPs, so it's no longer necessary to pad the nonce expiration lifetime with enough time to manually enter the OTP.


git-svn-id: https://plugins.svn.wordpress.org/google-authenticator-per-user-prompt/trunk@912336 b8457f37-d9ea-0310-8a92-e5e31aec5664
Specify the time unit in OTP constants

git-svn-id: https://plugins.svn.wordpress.org/google-authenticator-per-user-prompt/trunk@912337 b8457f37-d9ea-0310-8a92-e5e31aec5664