Updated openstack/openstack
Project: openstack/neutron  b4f136f19f3a6d8efc978fd743224b3d7d11758c
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Edge driver: Improve exception handling

Improve exception handling in the edge driver code.

Partial-Bug: #1305032

Change-Id: I727a7389aff216c4347de5605b8b1979d3e5a94e