Remove infrastructure branch from netci.groovy
Remove infrastructure branch from netci.groovy

After the merge of #1041, we can remove testing from CI for the
*/infrastructure branch

KKhurin/wcf,ericstj/wcf,imcarolwang/wcf,dotnet/wcf,MattGal/wcf,KKhurin/wcf,dotnet/wcf,zhenlan/wcf,zhenlan/wcf,iamjasonp/wcf,hongdai/wcf,imcarolwang/wcf,khdang/wcf,shmao/wcf,shmao/wcf,iamjasonp/wcf,StephenBonikowsky/wcf,imcarolwang/wcf,MattGal/wcf,ElJerry/wcf,khdang/wcf,StephenBonikowsky/wcf,ericstj/wcf,mconnew/wcf,hongdai/wcf,mconnew/wcf,dotnet/wcf,ElJerry/wcf,mconnew/wcf