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Old bootstrap code used the netinfo without starting libvirtd.
Now the vdsm.netinfo requires active libvirtd.
As result the bridge creation fails.

commit 38c0748656e9da14e071ca3f51b350af675c7d60
Author: Alon Bar-Lev <alonbl>
Date:   Sun Oct 28 12:16:44 2012 +0200

    api: start libvirtd when netinfo module is loaded
    
    The old bootstrap code does not start the libvirtd service before
    using the netinfo module.
    
    The current vdsm.netinfo needs running libvirtd or it fails.
    
    This patch starts the libvirtd service during the import of the
    compatibility module.
    
    Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=870734
    Change-Id: I5005b2f3fbb074f6ad08a8516140011f9a9cd3aa
    Signed-off-by: Alon Bar-Lev <alonbl>

https://gerrit.eng.lab.tlv.redhat.com/#/c/2929/

Add vdsm-4.9.6-41.0.el6_3.x86_64 (3.1) host to rhevm rhevm-3.0.7_0001-2.el6_3.x86_64 (3.0)

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHSA-2012-1508.html