Fix string formatting in api/metadata/vendordata_json.py
Fix string formatting in api/metadata/vendordata_json.py

The string format should be "%(logprefix)s", add the missing "s" in one
case.

The strings currently do not include a space after the "s" which
confuses translators.  Add the space and remove it from logprefix.

Change-Id: I6b3113e184c9c3cee1e2ebe448655c7488efb61b
Closes-Bug: #1496273

cernops/nova,openstack/nova,vmturbo/nova,CCI-MOC/nova,noironetworks/nova,alaski/nova,mahak/nova,edulramirez/nova,Juniper/nova,Francis-Liu/animated-broccoli,phenoxim/nova,devendermishrajio/nova,vmturbo/nova,rajalokan/nova,mahak/nova,phenoxim/nova,raildo/nova,rajalokan/nova,cernops/nova,sebrandon1/nova,MountainWei/nova,openstack/nova,rajalokan/nova,cernops/nova,mikalstill/nova,BeyondTheClouds/nova,gooddata/openstack-nova,klmitch/nova,devendermishrajio/nova,apporc/nova,gooddata/openstack-nova,Juniper/nova,gooddata/openstack-nova,scripnichenko/nova,Juniper/nova,zhimin711/nova,scripnichenko/nova,apporc/nova,edulramirez/nova,rahulunair/nova,mikalstill/nova,NeCTAR-RC/nova,vmturbo/nova,alaski/nova,Juniper/nova,felixma/nova,raildo/nova,BeyondTheClouds/nova,BeyondTheClouds/nova,CCI-MOC/nova,CEG-FYP-OpenStack/scheduler,dims/nova,mahak/nova,bigswitch/nova,JianyuWang/nova,fnordahl/nova,dims/nova,klmitch/nova,klmitch/nova,TwinkleChawla/nova,cloudbase/nova,MountainWei/nova,sebrandon1/nova,rahulunair/nova,jianghuaw/nova,hanlind/nova,zhimin711/nova,CEG-FYP-OpenStack/scheduler,klmitch/nova,rajalokan/nova,felixma/nova,mikalstill/nova,hanlind/nova,cloudbase/nova,jianghuaw/nova,fnordahl/nova,JianyuWang/nova,Francis-Liu/animated-broccoli,TwinkleChawla/nova,jianghuaw/nova,sebrandon1/nova,bigswitch/nova,gooddata/openstack-nova,noironetworks/nova,cyx1231st/nova,NeCTAR-RC/nova,openstack/nova,cloudbase/nova,jianghuaw/nova,hanlind/nova,rahulunair/nova,vmturbo/nova,cyx1231st/nova