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See fedora bug https://bugzilla.redhat.com/show_bug.cgi?id=1135488

If we default to adding 4 usbredir devices, we fill up all the emulated USB2 slots, and directly assigned devices are forced to fall back to USB1

This upstream commit changes the default to 2 usbredir devices, we should pull it into RHEL:

commit 3933ff101b880898c9e7a502efd641db9c4bf8a5
Author: Cole Robinson <crobinso>
Date:   Sat Sep 20 20:16:31 2014 -0400

    guest: Limit number of default usb redirdevs to 2 (bug 1135488)

With virt-manager-1.1.0-10.el7.noarch

1. #virt-manager 
2. install a guest
3. double click the guest to open it, click "Details" button
4. check the hardware list

Result:
there are 4 usb redirector devices in the list
"USB Redirector 1"
"USB Redirector 2"
"USB Redirector 3"
"USB Redirector 4"

Verify with virt-manager-1.1.0-11.el7.noarch

Result:
Just two usb redirector devices in the list
"USB Redirector 1"
"USB Redirector 2"

Do you think the steps are enough to verify this bug?

yes, these steps show there are only two usb redirector devices added by default.

As comment 6 and comment 7, move to VERIFIED

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.

https://rhn.redhat.com/errata/RHBA-2015-0427.html