autotest/virt-test — pull request #1576 by yumingfei (2014-04-08 07:17:35+00:00)
Title: utils_test.libvirt: Fix pre_pool for iscsi_get_sessions.

I adopt @will-Do 's idea to recover tuple of get_iscsi_sessions.
Because, the destroy failed of iscsi-pool caused by not suitable ip_addr,
so we should use what we get from sessions.
@jferlan, you can try this one now.

I have left the port in returns of sessions for extension in future when we need that port.

* Let iscsi.get_iscsi_sessions return tuple of target and address
* Before cleanup of pool in PoolVolumeTest, we should check
whether pool exists.
* As iscsi.iscsi_get_sessions returns ip_addr and port,
we should remove port for pool-operations.