By default, libvirtd uses ports 49152 to 49215 for live-migration,
as specified in qemu.conf
Since these ports is subset to ephemeral port range, which is from
32768 to 61000 for linux, it can be consumed by any other service
as well. It causes live-migration to fail, with below error:
Live Migration failure: internal error: Unable to find an unused
port in range 'migration' (49152-49215)
Using port range out of ephemeral port range.
Change-Id: I2039eca87c11638faf6262259b7bcface982f5c6