Update user davewalker's affiliation
Update user davewalker's affiliation

Adding end_date to the previous entry for user davewalker
and added a new entry.

Change-Id: I9df1a858a943a25e2e9d64315a26824dbb3c4f61
Signed-off-by: Dave Walker (Daviey) <a88b7dcd1a9e3e17770bbaa6d7515b31a2d7e85d@daviey.com>

openstack/stackalytics,danielmellado/stackalytics,Code-Fly/stackalytics,AlexanderYAPPO/stackalytics,mohitsethi/stackalytics,stackforge/stackalytics,AlexanderYAPPO/stackalytics,0xf2/stackalytics,Mirantis/stackalytics,stackforge/stackalytics,AlexanderYAPPO/stackalytics,openstack/stackalytics,nihilifer/stackalytics,Solinea/stackalytics,danielmellado/stackalytics,Mirantis/stackalytics,mhharsh/stackalytics,0xf2/stackalytics,dliu2015/stackalytics_zanata,Mirantis/stackalytics,openstack/stackalytics,0xf2/stackalytics,mhharsh/stackalytics,Solinea/stackalytics,mhharsh/stackalytics,dliu2015/stackalytics_zanata,openstack/stackalytics,dliu2015/stackalytics_zanata,nihilifer/stackalytics,0xf2/stackalytics,danielmellado/stackalytics,Code-Fly/stackalytics,nihilifer/stackalytics,mohitsethi/stackalytics,mohitsethi/stackalytics,stackforge/stackalytics,Code-Fly/stackalytics,Solinea/stackalytics