Ensure that lun_id is an int

The map_vol_to_host function was treating the lun number
as a string rather than an int.  This was causing attempts
to mount storwize_svc volumes to Hyper-V nodes to fail as they
were checking an integer type against a unicode type which
would fail.

This change casts result_lun to an integer after the value has
gone through the ssh injection attack check.  This way Hyper-V
is able to verify if the found LUN is the target LUN, enabling
mount of storwize_svc volumes to Hyper-V.

Change-Id: I96d179f2a58e5948c8ba6c9ae618daad7b8d4c86
Closes-bug: 1269915
Remove explicit dependency on amqplib

amqp (or amqplib) is only accessed via kombu, and kombu
already specifies the right dependency (either amqp if new
enough or amqplib for old versions of kombu).

Change-Id: I4efa419db1befdfcbe639a8557e21eb97ca3a26e
Merge "Ensure that lun_id is an int"
Merge "Remove explicit dependency on amqplib"