engine: Extract Qpid specific notation

The Qpid notation within host installation module is
being extracted to enable additional broker type to be
supported (i.e. RabbitMQ which is introduced in the next
patch).

Change-Id: I74eadd63cb66231ee240792cebca83d19db9bccb
Signed-off-by: Moti Asayag <masayag@redhat.com>