[libvirt] [RFC 5/5]: Rewrite findLuns function

[Chris Lalancette]

This rather large patch rewrites the virStorageBackendISCSIFindLUNs() function
to only rely on sysfs for finding LUNs, given a session number.  Along the way,
it also fixes the bug where we wouldn't find LUNs for older kernels (with the
block:sda format), and also (possibly) fixes a race condition where we could try
to find the LUN before udev has finished connecting it.  I say it "possibly"
fixes it because I haven't been able to hit it so far, but I definitely need
more testing to try and confirm.

Signed-off-by: Chris Lalancette <clalance at redhat.com>

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