+++ This bug was initially created as a clone of Bug #1923975 +++

Description of problem:

When os-brick attaches an iscsi volume, it executes "iscsiadm -m session" first to obtain
all existing sessions, then execute "iscsiadm -m node -T <target> -p <portal> --login"
if it has not yet logged into that portal.

If multipath is enabled, it execute these process in threads and run iscsi commands concurrently
for multiple iscsi devices under an multipath device it is attaching.
However current implementation doesn't care about the failure in "iscsiadm -m session",
and if the command fails the volume attachment never completes.


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