Warn when using insecure auth

[jtnord]

Additionally if running in FIPS use an error in the form validation and do not support auth without SSL or TLS.

This is handled when we attempt to send as the config is part of the global configuration and could leave the config in an non determinate state

Testing done

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[jglick]

but

java.lang.AssertionError: 

Expected: is <OK: <div/>>
     but: was <OK>
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:20)
	at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:6)
	at hudson.tasks.MailerTest.authenticationFormValidation(MailerTest.java:307)