engine-config: Add EncryptHostCommunication

Make accessible EncryptHostCommunication via engine-config tool.

Change-Id: I9ba5e548d031658089641a5442b5068515b61676
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1003117
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>