Export 'On Hold' email addresses as 'opted out'

CiviCRM's bounce processing marks addresses with hard bounces as
'On Hold'.  We shouldn't send emails to these addresses in Silverpop,
so this commit exports 'On Hold' email addresses the same as opted
out or 'do not email' contact records.

Change-Id: I4b36dd63b62d1723356313c24d7ba33dd47ef8b1
Merge remote-tracking branch 'origin/master' into deploy

05b6713 Export 'On Hold' email addresses as 'opted out'

Change-Id: I1dcccbe4257ab7b34589ca5b703954b14b6dbfd3