neutron: log error when neutron query fails
neutron: log error when neutron query fails

When neutron is not correctly configured queries will
fail and nothing will be logged. This commit fix it.

Change-Id: I32284750daf58575522df6e5bb4c017a68601a48
Reviewed-on: http://softwarefactory-project.io/r/5267
Reviewed-by: Masco Kaliyamoorthy <75e2683cfc94863ef78c25b1a3fd996b311a68bc@redhat.com>
Reviewed-by: Nicolas PLANEL <2ba60255afd05ede961f6b959482fc724759f990@redhat.com>
Tested-by: Nicolas PLANEL <2ba60255afd05ede961f6b959482fc724759f990@redhat.com>
Workflow: Nicolas PLANEL <2ba60255afd05ede961f6b959482fc724759f990@redhat.com>
Tested-by: Jenkins CI <d95b56ce41a2e1ac4cecdd398defd7414407cc08@softwarefactory-project.io>

lebauce/skydive,safchain/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,skydive-project/skydive,lebauce/skydive,safchain/skydive,safchain/skydive,safchain/skydive,redhat-cip/skydive,skydive-project/skydive,lebauce/skydive,skydive-project/skydive,lebauce/skydive,lebauce/skydive,safchain/skydive,skydive-project/skydive,redhat-cip/skydive,safchain/skydive,safchain/skydive,skydive-project/skydive,safchain/skydive,lebauce/skydive,redhat-cip/skydive,skydive-project/skydive