Since 9f781da6

Resolve a libvirtd crash in virStoragePoolSourceFindDuplicate()
when there is an existing SCSI pool defined with adapter type as
'scsi_host' and defining a new SCSI pool with adapter type as
'fc_host' and parent attribute missing or vice versa.

For example, if there is an existing SCSI pool with adapter type
as 'scsi_host' defined using the following XML

<pool type='scsi'>
  <name>TEST_SCSI_POOL</name>
    <source>
       <adapter type='scsi_host' name='scsi_host1'/>
    </source>
    <target>
        <path>/dev/disk/by-path</path>
    </target>
</pool>

When defining another SCSI pool with adapter type as 'fc_host' using the
following XML will crash libvirtd

<pool type='scsi'>
  <name>TEST_SCSI_FC_POOL</name>
  <source>
     <adapter type='fc_host' wwnn='1234567890abcdef' wwpn='abcdef1234567890'/>
  </source>
  <target>
     <path>/dev/disk/by-path</path>
  </target>
</pool>

Same is true for the reverse case as well where there exists a SCSI pool
with adapter type as 'fc_host' and another SCSI pool is defined with
adapter type as 'scsi_host'.

This happens because for fc_host 'name' is optional attribute whereas for
scsi_host its mandatory. However the check in libvirt for finding duplicate
storage pools didn't take that into account while comparing
Signed-off-by: NPradipta Kr. Banerjee <bpradip@in.ibm.com>