Handle eqlx SSH connection close on abort.
Handle eqlx SSH connection close on abort.

EqualLogic array CLI operation timeout causes the
SSH thread to be aborted. This would cause SSH
sessions to be orphaned and hit a max connection
limit on the array. This fix catches these aborts
and makes sure the connection is closed.

Change-Id: I9392fd5dd79eb44f252bf50217f17cc473e6f2f0
Closes-Bug: 1374613

tlakshman26/cinder-https-changes,openstack/cinder,Akrog/cinder,nexusriot/cinder,apporc/cinder,Akrog/cinder,manojhirway/ExistingImagesOnNFS,Paul-Ezell/cinder-1,JioCloud/cinder,tlakshman26/cinder-new-branch,scality/cinder,manojhirway/ExistingImagesOnNFS,blueboxgroup/cinder,hguemar/cinder,mahak/cinder,apporc/cinder,Nexenta/cinder,bswartz/cinder,eharney/cinder,blueboxgroup/cinder,JioCloud/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,NetApp/cinder,potsmaster/cinder,julianwang/cinder,j-griffith/cinder,Accelerite/cinder,ge0rgi/cinder,tlakshman26/cinder-https-changes,mahak/cinder,rakeshmi/cinder,dims/cinder,saeki-masaki/cinder,phenoxim/cinder,potsmaster/cinder,petrutlucian94/cinder,takeshineshiro/cinder,Nexenta/cinder,Datera/cinder,dims/cinder,takeshineshiro/cinder,cloudbase/cinder,tlakshman26/cinder-new-branch,leilihh/cinder,Hybrid-Cloud/cinder,Hybrid-Cloud/cinder,petrutlucian94/cinder,abusse/cinder,sasukeh/cinder,nikesh-mahalka/cinder,scottdangelo/RemoveVolumeMangerLocks,leilihh/cinder,duhzecca/cinder,julianwang/cinder,eharney/cinder,j-griffith/cinder,scality/cinder,winndows/cinder,nexusriot/cinder,duhzecca/cinder,Paul-Ezell/cinder-1,nikesh-mahalka/cinder,openstack/cinder,Datera/cinder,saeki-masaki/cinder,rakeshmi/cinder,winndows/cinder,abusse/cinder,Accelerite/cinder,CloudServer/cinder,hguemar/cinder,scottdangelo/RemoveVolumeMangerLocks,bswartz/cinder,sasukeh/cinder,NetApp/cinder,phenoxim/cinder,cloudbase/cinder,tlakshman26/cinder-bug-fix-volume-conversion-full,CloudServer/cinder