sosetup: improve input validation for email address

[GoogleCodeExporter]

sosetup: improve input validation for email address

Original issue reported on code.google.com by doug.bu...@gmail.com on 18 Feb 2015 at 2:39

[dougburks]

commit:
Security-Onion-Solutions/securityonion-setup@24f7241

[dougburks]

submitted for testing:
https://groups.google.com/d/topic/security-onion-testing/HBWNcVaE8L4/discussion

[dougburks]

Published:
http://blog.securityonion.net/2015/07/new-securityonion-setup-package-allows.html