Ignore .pem files
Ignore .pem files

Ignore certificate files created by running stack.sh.

Change-Id: Ib11e87261dad5985e7852c339243035d715924ed
Signed-off-by: Doug Hellmann <8c845c26a3868dadec615703cd974244eb2ac6d1@dreamhost.com>

openstack-dev/devstack,shootstar/devstacktest,noironetworks/devstack,sc68cal/devstack,neerja28/Devstack_GlusterFS,costingalan/devstack,dtroyer/devstack,nawawi/openstack,cloudbuilders/devstack,noironetworks/devstack,bigswitch/devstack,ozamiatin/devstack,citrix-openstack-build/devstack,citrix-openstack-build/devstack,Mahito/devstack,ewindisch/raspi-devstack,bq-xiao/devstack,nawawi/openstack,ewindisch/raspi-devstack,andrewrothstein/devstack,vishnugonela/devstack,vsham20/devstack,pacinete/devstack,j4/devstack,mssumanth/devstack,armando-migliaccio/devstack,inkerra/devstack,mssumanth/devstack,deepakselvaraj/devstack,HPCHub/devstack,bswartz/devstack,CloudServer/devstack,bljgaurav/openstack-test,andrewrothstein/devstack,NaokiMiyata/devstack,upadhyay-prashant/devstack,upadhyay-prashant/devstack,srics/devstack,pczerkas/devstack,wenhuizhang/devstack,pombredanne/devstack,dirkmueller/devstack,rushiagr/devstack,flavio-fernandes/devstack,bljgaurav/openstack-test,group-policy/devstack,avvocatodemarchis/devstack,nati/devstack_public,atulpatil301/devstack,sequenceiq/devstack,parul24/devstack,openstack-dev/devstack,vsham20/devstack,mmasaki/devstack,innodee/openstackk,Juniper/devstack,virtualopensystems/devstack,ykaneko/devstack,BSJAIN92/OpenStack,yamt/devstack,flavio-fernandes/devstack,pacinete/devstack,Millnert/contrail-devstack,atulpatil301/devstack,thomasem/devstack,kplus/devstack-moonshot,promptworks/devstack,ozamiatin/devstack,dirkmueller/devstack,BSJAIN92/OpenStack,Yuriy-Leonov/devstack,NaokiMiyata/devstack,eharney/devstack,ykaneko/devstack,sstrato/devstack,samgoon/devstack,group-policy/devstack,eshnil2000/devstack,affo/devstack,affo/devstack,cloudbuilders/devstack,sequenceiq/devstack,mmasaki/devstack,dtroyer/devstack,HPCHub/devstack,nati/devstack_public,liuquansheng47/devstack,rushiagr/devstack,wenhuizhang/devstack,TwinkleChawla/devstack,thomasem/devstack,samgoon/devstack,avvocatodemarchis/devstack,nuxeh/devstack,LoHChina/devstack,parul24/devstack,CloudServer/devstack,herrsechs/devstack,liuquansheng47/devstack,promptworks/devstack,richliu/devstack,mc2014/devstack,kplus/devstack-moonshot,jamielennox/devstack,bswartz/devstack,olivierlemasle/devstack,prithivm/branch01,neerja28/Devstack_GlusterFS,sc68cal/devstack,olivierlemasle/devstack,williamthegrey/devstack,bigswitch/devstack,richliu/devstack,bq-xiao/devstack,varunarya10/devstack,LoHChina/devstack,j4/devstack,pombredanne/devstack,JioCloud/devstack,eharney/devstack,costingalan/devstack,varunarya10/devstack,pczerkas/devstack,tianweizhang/devstack,herrsechs/devstack,CiscoSystems/devstack,tianweizhang/devstack,Mahito/devstack,vishnugonela/devstack,prithivm/branch01,mc2014/devstack,TwinkleChawla/devstack,nuxeh/devstack