add OSS snapshots as a plugin repository to resolve custom enforcer rule
add OSS snapshots as a plugin repository to resolve custom enforcer rule

Original commit: elastic/x-pack-elasticsearch@96e052b2dea3c1a514236f6b42e6bbc8776f7c7c

gingerwizard/elasticsearch,gfyoung/elasticsearch,robin13/elasticsearch,strapdata/elassandra,scorpionvicky/elasticsearch,coding0011/elasticsearch,uschindler/elasticsearch,gingerwizard/elasticsearch,GlenRSmith/elasticsearch,gfyoung/elasticsearch,gfyoung/elasticsearch,coding0011/elasticsearch,vroyer/elassandra,robin13/elasticsearch,robin13/elasticsearch,uschindler/elasticsearch,GlenRSmith/elasticsearch,robin13/elasticsearch,coding0011/elasticsearch,coding0011/elasticsearch,strapdata/elassandra,HonzaKral/elasticsearch,gingerwizard/elasticsearch,scorpionvicky/elasticsearch,nknize/elasticsearch,vroyer/elassandra,strapdata/elassandra,gingerwizard/elasticsearch,gfyoung/elasticsearch,strapdata/elassandra,scorpionvicky/elasticsearch,coding0011/elasticsearch,uschindler/elasticsearch,gingerwizard/elasticsearch,GlenRSmith/elasticsearch,scorpionvicky/elasticsearch,GlenRSmith/elasticsearch,GlenRSmith/elasticsearch,gingerwizard/elasticsearch,HonzaKral/elasticsearch,scorpionvicky/elasticsearch,vroyer/elassandra,robin13/elasticsearch,nknize/elasticsearch,gfyoung/elasticsearch,gingerwizard/elasticsearch,strapdata/elassandra,nknize/elasticsearch,nknize/elasticsearch,HonzaKral/elasticsearch,uschindler/elasticsearch,HonzaKral/elasticsearch,nknize/elasticsearch,uschindler/elasticsearch