Re: [jclouds] JCLOUDS-496: Use the security groups options in the portable TemplateOptions (#439)

[Andrew Phillips]

>     public Optional<Set<String>> getSecurityGroupNames() {
> -      return securityGroupNames;
> +      return getGroups().isEmpty()? Optional.<Set<String>> absent() : 
> Optional.of(getGroups());

[minor] Just spacing: `return getGroups().isEmpty() ? 
Optional.<Set<String>>absent() : Optional.of(getGroups());`

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