conf: prefer camelCase for launchSecurity

conf: prefer camelCase for launchSecurity

Adjust the documentation, parser and tests to change:
launch-security -> launchSecurity
reduced-phys-bits -> reducedPhysBits
dh-cert -> dhCert

Also fix the headline in formatdomain.html to be more generic,
and some leftover closing elements in the documentation.

Signed-off-by: Ján Tomko <jtomko@redhat.com>
Reviewed-by: Brijesh Singh <brijesh.singh@amd.com>
Tested-by: Brijesh Singh <brijesh.singh@amd.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>